Imgcodecs (JavaCPP Presets for OpenCV 4.11.0-1.5.12 API)

java.lang.Object
- org.opencv.imgcodecs.Imgcodecs

```
public class Imgcodecs
extends Object
```

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`IMREAD_ANYCOLOR`
`static int`	`IMREAD_ANYDEPTH`
`static int`	`IMREAD_COLOR`
`static int`	`IMREAD_COLOR_BGR`
`static int`	`IMREAD_COLOR_RGB`
`static int`	`IMREAD_GRAYSCALE`
`static int`	`IMREAD_IGNORE_ORIENTATION`
`static int`	`IMREAD_LOAD_GDAL`
`static int`	`IMREAD_REDUCED_COLOR_2`
`static int`	`IMREAD_REDUCED_COLOR_4`
`static int`	`IMREAD_REDUCED_COLOR_8`
`static int`	`IMREAD_REDUCED_GRAYSCALE_2`
`static int`	`IMREAD_REDUCED_GRAYSCALE_4`
`static int`	`IMREAD_REDUCED_GRAYSCALE_8`
`static int`	`IMREAD_UNCHANGED`
`static int`	`IMWRITE_AVIF_DEPTH`
`static int`	`IMWRITE_AVIF_QUALITY`
`static int`	`IMWRITE_AVIF_SPEED`
`static int`	`IMWRITE_EXR_COMPRESSION`
`static int`	`IMWRITE_EXR_COMPRESSION_B44`
`static int`	`IMWRITE_EXR_COMPRESSION_B44A`
`static int`	`IMWRITE_EXR_COMPRESSION_DWAA`
`static int`	`IMWRITE_EXR_COMPRESSION_DWAB`
`static int`	`IMWRITE_EXR_COMPRESSION_NO`
`static int`	`IMWRITE_EXR_COMPRESSION_PIZ`
`static int`	`IMWRITE_EXR_COMPRESSION_PXR24`
`static int`	`IMWRITE_EXR_COMPRESSION_RLE`
`static int`	`IMWRITE_EXR_COMPRESSION_ZIP`
`static int`	`IMWRITE_EXR_COMPRESSION_ZIPS`
`static int`	`IMWRITE_EXR_DWA_COMPRESSION_LEVEL`
`static int`	`IMWRITE_EXR_TYPE`
`static int`	`IMWRITE_EXR_TYPE_FLOAT`
`static int`	`IMWRITE_EXR_TYPE_HALF`
`static int`	`IMWRITE_GIF_COLORTABLE`
`static int`	`IMWRITE_GIF_COLORTABLE_SIZE_128`
`static int`	`IMWRITE_GIF_COLORTABLE_SIZE_16`
`static int`	`IMWRITE_GIF_COLORTABLE_SIZE_256`
`static int`	`IMWRITE_GIF_COLORTABLE_SIZE_32`
`static int`	`IMWRITE_GIF_COLORTABLE_SIZE_64`
`static int`	`IMWRITE_GIF_COLORTABLE_SIZE_8`
`static int`	`IMWRITE_GIF_DITHER`
`static int`	`IMWRITE_GIF_FAST_FLOYD_DITHER`
`static int`	`IMWRITE_GIF_FAST_NO_DITHER`
`static int`	`IMWRITE_GIF_LOOP`
`static int`	`IMWRITE_GIF_QUALITY`
`static int`	`IMWRITE_GIF_SPEED`
`static int`	`IMWRITE_GIF_TRANSPARENCY`
`static int`	`IMWRITE_HDR_COMPRESSION`
`static int`	`IMWRITE_HDR_COMPRESSION_NONE`
`static int`	`IMWRITE_HDR_COMPRESSION_RLE`
`static int`	`IMWRITE_JPEG_CHROMA_QUALITY`
`static int`	`IMWRITE_JPEG_LUMA_QUALITY`
`static int`	`IMWRITE_JPEG_OPTIMIZE`
`static int`	`IMWRITE_JPEG_PROGRESSIVE`
`static int`	`IMWRITE_JPEG_QUALITY`
`static int`	`IMWRITE_JPEG_RST_INTERVAL`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_411`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_420`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_422`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_440`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_444`
`static int`	`IMWRITE_JPEG2000_COMPRESSION_X1000`
`static int`	`IMWRITE_JPEGXL_DECODING_SPEED`
`static int`	`IMWRITE_JPEGXL_DISTANCE`
`static int`	`IMWRITE_JPEGXL_EFFORT`
`static int`	`IMWRITE_JPEGXL_QUALITY`
`static int`	`IMWRITE_PAM_FORMAT_BLACKANDWHITE`
`static int`	`IMWRITE_PAM_FORMAT_GRAYSCALE`
`static int`	`IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA`
`static int`	`IMWRITE_PAM_FORMAT_NULL`
`static int`	`IMWRITE_PAM_FORMAT_RGB`
`static int`	`IMWRITE_PAM_FORMAT_RGB_ALPHA`
`static int`	`IMWRITE_PAM_TUPLETYPE`
`static int`	`IMWRITE_PNG_BILEVEL`
`static int`	`IMWRITE_PNG_COMPRESSION`
`static int`	`IMWRITE_PNG_STRATEGY`
`static int`	`IMWRITE_PNG_STRATEGY_DEFAULT`
`static int`	`IMWRITE_PNG_STRATEGY_FILTERED`
`static int`	`IMWRITE_PNG_STRATEGY_FIXED`
`static int`	`IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY`
`static int`	`IMWRITE_PNG_STRATEGY_RLE`
`static int`	`IMWRITE_PXM_BINARY`
`static int`	`IMWRITE_TIFF_COMPRESSION`
`static int`	`IMWRITE_TIFF_COMPRESSION_ADOBE_DEFLATE`
`static int`	`IMWRITE_TIFF_COMPRESSION_CCITT_T4`
`static int`	`IMWRITE_TIFF_COMPRESSION_CCITT_T6`
`static int`	`IMWRITE_TIFF_COMPRESSION_CCITTFAX3`
`static int`	`IMWRITE_TIFF_COMPRESSION_CCITTFAX4`
`static int`	`IMWRITE_TIFF_COMPRESSION_CCITTRLE`
`static int`	`IMWRITE_TIFF_COMPRESSION_CCITTRLEW`
`static int`	`IMWRITE_TIFF_COMPRESSION_DCS`
`static int`	`IMWRITE_TIFF_COMPRESSION_DEFLATE`
`static int`	`IMWRITE_TIFF_COMPRESSION_IT8BL`
`static int`	`IMWRITE_TIFF_COMPRESSION_IT8CTPAD`
`static int`	`IMWRITE_TIFF_COMPRESSION_IT8LW`
`static int`	`IMWRITE_TIFF_COMPRESSION_IT8MP`
`static int`	`IMWRITE_TIFF_COMPRESSION_JBIG`
`static int`	`IMWRITE_TIFF_COMPRESSION_JP2000`
`static int`	`IMWRITE_TIFF_COMPRESSION_JPEG`
`static int`	`IMWRITE_TIFF_COMPRESSION_JXL`
`static int`	`IMWRITE_TIFF_COMPRESSION_LERC`
`static int`	`IMWRITE_TIFF_COMPRESSION_LZMA`
`static int`	`IMWRITE_TIFF_COMPRESSION_LZW`
`static int`	`IMWRITE_TIFF_COMPRESSION_NEXT`
`static int`	`IMWRITE_TIFF_COMPRESSION_NONE`
`static int`	`IMWRITE_TIFF_COMPRESSION_OJPEG`
`static int`	`IMWRITE_TIFF_COMPRESSION_PACKBITS`
`static int`	`IMWRITE_TIFF_COMPRESSION_PIXARFILM`
`static int`	`IMWRITE_TIFF_COMPRESSION_PIXARLOG`
`static int`	`IMWRITE_TIFF_COMPRESSION_SGILOG`
`static int`	`IMWRITE_TIFF_COMPRESSION_SGILOG24`
`static int`	`IMWRITE_TIFF_COMPRESSION_T43`
`static int`	`IMWRITE_TIFF_COMPRESSION_T85`
`static int`	`IMWRITE_TIFF_COMPRESSION_THUNDERSCAN`
`static int`	`IMWRITE_TIFF_COMPRESSION_WEBP`
`static int`	`IMWRITE_TIFF_COMPRESSION_ZSTD`
`static int`	`IMWRITE_TIFF_PREDICTOR`
`static int`	`IMWRITE_TIFF_PREDICTOR_FLOATINGPOINT`
`static int`	`IMWRITE_TIFF_PREDICTOR_HORIZONTAL`
`static int`	`IMWRITE_TIFF_PREDICTOR_NONE`
`static int`	`IMWRITE_TIFF_RESUNIT`
`static int`	`IMWRITE_TIFF_ROWSPERSTRIP`
`static int`	`IMWRITE_TIFF_XDPI`
`static int`	`IMWRITE_TIFF_YDPI`
`static int`	`IMWRITE_WEBP_QUALITY`

Constructor Summary

Constructors
Constructor and Description

Imgcodecs()

Constructors
Constructor and Description
`Imgcodecs()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static boolean`	`haveImageReader(String filename)` Checks if the specified image file can be decoded by OpenCV.
`static boolean`	`haveImageWriter(String filename)` Checks if the specified image file or specified file extension can be encoded by OpenCV.
`static long`	`imcount(String filename)` Returns the number of images inside the given file The function imcount returns the number of pages in a multi-page image (e.g.
`static long`	`imcount(String filename, int flags)` Returns the number of images inside the given file The function imcount returns the number of pages in a multi-page image (e.g.
`static Mat`	`imdecode(Mat buf, int flags)` Reads an image from a buffer in memory.
`static boolean`	`imdecodemulti(Mat buf, int flags, List<Mat> mats)` Reads a multi-page image from a buffer in memory.
`static boolean`	`imdecodemulti(Mat buf, int flags, List<Mat> mats, Range range)` Reads a multi-page image from a buffer in memory.
`static boolean`	`imencode(String ext, Mat img, MatOfByte buf)` Encodes an image into a memory buffer.
`static boolean`	`imencode(String ext, Mat img, MatOfByte buf, MatOfInt params)` Encodes an image into a memory buffer.
`static boolean`	`imencodemulti(String ext, List<Mat> imgs, MatOfByte buf)` Encodes array of images into a memory buffer.
`static boolean`	`imencodemulti(String ext, List<Mat> imgs, MatOfByte buf, MatOfInt params)` Encodes array of images into a memory buffer.
`static Mat`	`imread(String filename)` Loads an image from a file.
`static Mat`	`imread(String filename, int flags)` Loads an image from a file.
`static void`	`imread(String filename, Mat dst)` Loads an image from a file.
`static void`	`imread(String filename, Mat dst, int flags)` Loads an image from a file.
`static boolean`	`imreadanimation(String filename, Animation animation)` Loads frames from an animated image file into an Animation structure.
`static boolean`	`imreadanimation(String filename, Animation animation, int start)` Loads frames from an animated image file into an Animation structure.
`static boolean`	`imreadanimation(String filename, Animation animation, int start, int count)` Loads frames from an animated image file into an Animation structure.
`static boolean`	`imreadmulti(String filename, List<Mat> mats)` Loads a multi-page image from a file.
`static boolean`	`imreadmulti(String filename, List<Mat> mats, int flags)` Loads a multi-page image from a file.
`static boolean`	`imreadmulti(String filename, List<Mat> mats, int start, int count)` Loads images of a multi-page image from a file.
`static boolean`	`imreadmulti(String filename, List<Mat> mats, int start, int count, int flags)` Loads images of a multi-page image from a file.
`static boolean`	`imwrite(String filename, Mat img)` Saves an image to a specified file.
`static boolean`	`imwrite(String filename, Mat img, MatOfInt params)` Saves an image to a specified file.
`static boolean`	`imwriteanimation(String filename, Animation animation)` Saves an Animation to a specified file.
`static boolean`	`imwriteanimation(String filename, Animation animation, MatOfInt params)` Saves an Animation to a specified file.
`static boolean`	`imwritemulti(String filename, List<Mat> img)`
`static boolean`	`imwritemulti(String filename, List<Mat> img, MatOfInt params)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - IMREAD_UNCHANGED
```
public static final int IMREAD_UNCHANGED
```
    See Also:
    
    Constant Field Values
  - IMREAD_GRAYSCALE
```
public static final int IMREAD_GRAYSCALE
```
    See Also:
    
    Constant Field Values
  - IMREAD_COLOR_BGR
```
public static final int IMREAD_COLOR_BGR
```
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    Constant Field Values
  - IMREAD_COLOR
```
public static final int IMREAD_COLOR
```
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    Constant Field Values
  - IMREAD_ANYDEPTH
```
public static final int IMREAD_ANYDEPTH
```
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    Constant Field Values
  - IMREAD_ANYCOLOR
```
public static final int IMREAD_ANYCOLOR
```
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    Constant Field Values
  - IMREAD_LOAD_GDAL
```
public static final int IMREAD_LOAD_GDAL
```
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    Constant Field Values
  - IMREAD_REDUCED_GRAYSCALE_2
```
public static final int IMREAD_REDUCED_GRAYSCALE_2
```
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    Constant Field Values
  - IMREAD_REDUCED_COLOR_2
```
public static final int IMREAD_REDUCED_COLOR_2
```
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    Constant Field Values
  - IMREAD_REDUCED_GRAYSCALE_4
```
public static final int IMREAD_REDUCED_GRAYSCALE_4
```
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    Constant Field Values
  - IMREAD_REDUCED_COLOR_4
```
public static final int IMREAD_REDUCED_COLOR_4
```
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    Constant Field Values
  - IMREAD_REDUCED_GRAYSCALE_8
```
public static final int IMREAD_REDUCED_GRAYSCALE_8
```
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    Constant Field Values
  - IMREAD_REDUCED_COLOR_8
```
public static final int IMREAD_REDUCED_COLOR_8
```
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    Constant Field Values
  - IMREAD_IGNORE_ORIENTATION
```
public static final int IMREAD_IGNORE_ORIENTATION
```
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    Constant Field Values
  - IMREAD_COLOR_RGB
```
public static final int IMREAD_COLOR_RGB
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_NO
```
public static final int IMWRITE_EXR_COMPRESSION_NO
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_RLE
```
public static final int IMWRITE_EXR_COMPRESSION_RLE
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_ZIPS
```
public static final int IMWRITE_EXR_COMPRESSION_ZIPS
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_ZIP
```
public static final int IMWRITE_EXR_COMPRESSION_ZIP
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_PIZ
```
public static final int IMWRITE_EXR_COMPRESSION_PIZ
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_PXR24
```
public static final int IMWRITE_EXR_COMPRESSION_PXR24
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_B44
```
public static final int IMWRITE_EXR_COMPRESSION_B44
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_B44A
```
public static final int IMWRITE_EXR_COMPRESSION_B44A
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_DWAA
```
public static final int IMWRITE_EXR_COMPRESSION_DWAA
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION_DWAB
```
public static final int IMWRITE_EXR_COMPRESSION_DWAB
```
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    Constant Field Values
  - IMWRITE_EXR_TYPE_HALF
```
public static final int IMWRITE_EXR_TYPE_HALF
```
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    Constant Field Values
  - IMWRITE_EXR_TYPE_FLOAT
```
public static final int IMWRITE_EXR_TYPE_FLOAT
```
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    Constant Field Values
  - IMWRITE_JPEG_QUALITY
```
public static final int IMWRITE_JPEG_QUALITY
```
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    Constant Field Values
  - IMWRITE_JPEG_PROGRESSIVE
```
public static final int IMWRITE_JPEG_PROGRESSIVE
```
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    Constant Field Values
  - IMWRITE_JPEG_OPTIMIZE
```
public static final int IMWRITE_JPEG_OPTIMIZE
```
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    Constant Field Values
  - IMWRITE_JPEG_RST_INTERVAL
```
public static final int IMWRITE_JPEG_RST_INTERVAL
```
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    Constant Field Values
  - IMWRITE_JPEG_LUMA_QUALITY
```
public static final int IMWRITE_JPEG_LUMA_QUALITY
```
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    Constant Field Values
  - IMWRITE_JPEG_CHROMA_QUALITY
```
public static final int IMWRITE_JPEG_CHROMA_QUALITY
```
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    Constant Field Values
  - IMWRITE_JPEG_SAMPLING_FACTOR
```
public static final int IMWRITE_JPEG_SAMPLING_FACTOR
```
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    Constant Field Values
  - IMWRITE_PNG_COMPRESSION
```
public static final int IMWRITE_PNG_COMPRESSION
```
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    Constant Field Values
  - IMWRITE_PNG_STRATEGY
```
public static final int IMWRITE_PNG_STRATEGY
```
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    Constant Field Values
  - IMWRITE_PNG_BILEVEL
```
public static final int IMWRITE_PNG_BILEVEL
```
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    Constant Field Values
  - IMWRITE_PXM_BINARY
```
public static final int IMWRITE_PXM_BINARY
```
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    Constant Field Values
  - IMWRITE_EXR_TYPE
```
public static final int IMWRITE_EXR_TYPE
```
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    Constant Field Values
  - IMWRITE_EXR_COMPRESSION
```
public static final int IMWRITE_EXR_COMPRESSION
```
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    Constant Field Values
  - IMWRITE_EXR_DWA_COMPRESSION_LEVEL
```
public static final int IMWRITE_EXR_DWA_COMPRESSION_LEVEL
```
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    Constant Field Values
  - IMWRITE_WEBP_QUALITY
```
public static final int IMWRITE_WEBP_QUALITY
```
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    Constant Field Values
  - IMWRITE_HDR_COMPRESSION
```
public static final int IMWRITE_HDR_COMPRESSION
```
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    Constant Field Values
  - IMWRITE_PAM_TUPLETYPE
```
public static final int IMWRITE_PAM_TUPLETYPE
```
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    Constant Field Values
  - IMWRITE_TIFF_RESUNIT
```
public static final int IMWRITE_TIFF_RESUNIT
```
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    Constant Field Values
  - IMWRITE_TIFF_XDPI
```
public static final int IMWRITE_TIFF_XDPI
```
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    Constant Field Values
  - IMWRITE_TIFF_YDPI
```
public static final int IMWRITE_TIFF_YDPI
```
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    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION
```
public static final int IMWRITE_TIFF_COMPRESSION
```
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    Constant Field Values
  - IMWRITE_TIFF_ROWSPERSTRIP
```
public static final int IMWRITE_TIFF_ROWSPERSTRIP
```
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    Constant Field Values
  - IMWRITE_TIFF_PREDICTOR
```
public static final int IMWRITE_TIFF_PREDICTOR
```
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    Constant Field Values
  - IMWRITE_JPEG2000_COMPRESSION_X1000
```
public static final int IMWRITE_JPEG2000_COMPRESSION_X1000
```
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    Constant Field Values
  - IMWRITE_AVIF_QUALITY
```
public static final int IMWRITE_AVIF_QUALITY
```
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    Constant Field Values
  - IMWRITE_AVIF_DEPTH
```
public static final int IMWRITE_AVIF_DEPTH
```
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    Constant Field Values
  - IMWRITE_AVIF_SPEED
```
public static final int IMWRITE_AVIF_SPEED
```
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    Constant Field Values
  - IMWRITE_JPEGXL_QUALITY
```
public static final int IMWRITE_JPEGXL_QUALITY
```
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    Constant Field Values
  - IMWRITE_JPEGXL_EFFORT
```
public static final int IMWRITE_JPEGXL_EFFORT
```
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    Constant Field Values
  - IMWRITE_JPEGXL_DISTANCE
```
public static final int IMWRITE_JPEGXL_DISTANCE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_JPEGXL_DECODING_SPEED
```
public static final int IMWRITE_JPEGXL_DECODING_SPEED
```
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    Constant Field Values
  - IMWRITE_GIF_LOOP
```
public static final int IMWRITE_GIF_LOOP
```
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    Constant Field Values
  - IMWRITE_GIF_SPEED
```
public static final int IMWRITE_GIF_SPEED
```
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    Constant Field Values
  - IMWRITE_GIF_QUALITY
```
public static final int IMWRITE_GIF_QUALITY
```
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    Constant Field Values
  - IMWRITE_GIF_DITHER
```
public static final int IMWRITE_GIF_DITHER
```
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    Constant Field Values
  - IMWRITE_GIF_TRANSPARENCY
```
public static final int IMWRITE_GIF_TRANSPARENCY
```
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    Constant Field Values
  - IMWRITE_GIF_COLORTABLE
```
public static final int IMWRITE_GIF_COLORTABLE
```
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    Constant Field Values
  - IMWRITE_GIF_FAST_NO_DITHER
```
public static final int IMWRITE_GIF_FAST_NO_DITHER
```
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    Constant Field Values
  - IMWRITE_GIF_FAST_FLOYD_DITHER
```
public static final int IMWRITE_GIF_FAST_FLOYD_DITHER
```
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    Constant Field Values
  - IMWRITE_GIF_COLORTABLE_SIZE_8
```
public static final int IMWRITE_GIF_COLORTABLE_SIZE_8
```
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    Constant Field Values
  - IMWRITE_GIF_COLORTABLE_SIZE_16
```
public static final int IMWRITE_GIF_COLORTABLE_SIZE_16
```
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    Constant Field Values
  - IMWRITE_GIF_COLORTABLE_SIZE_32
```
public static final int IMWRITE_GIF_COLORTABLE_SIZE_32
```
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    Constant Field Values
  - IMWRITE_GIF_COLORTABLE_SIZE_64
```
public static final int IMWRITE_GIF_COLORTABLE_SIZE_64
```
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    Constant Field Values
  - IMWRITE_GIF_COLORTABLE_SIZE_128
```
public static final int IMWRITE_GIF_COLORTABLE_SIZE_128
```
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    Constant Field Values
  - IMWRITE_GIF_COLORTABLE_SIZE_256
```
public static final int IMWRITE_GIF_COLORTABLE_SIZE_256
```
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    Constant Field Values
  - IMWRITE_HDR_COMPRESSION_NONE
```
public static final int IMWRITE_HDR_COMPRESSION_NONE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_HDR_COMPRESSION_RLE
```
public static final int IMWRITE_HDR_COMPRESSION_RLE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_JPEG_SAMPLING_FACTOR_411
```
public static final int IMWRITE_JPEG_SAMPLING_FACTOR_411
```
    See Also:
    
    Constant Field Values
  - IMWRITE_JPEG_SAMPLING_FACTOR_420
```
public static final int IMWRITE_JPEG_SAMPLING_FACTOR_420
```
    See Also:
    
    Constant Field Values
  - IMWRITE_JPEG_SAMPLING_FACTOR_422
```
public static final int IMWRITE_JPEG_SAMPLING_FACTOR_422
```
    See Also:
    
    Constant Field Values
  - IMWRITE_JPEG_SAMPLING_FACTOR_440
```
public static final int IMWRITE_JPEG_SAMPLING_FACTOR_440
```
    See Also:
    
    Constant Field Values
  - IMWRITE_JPEG_SAMPLING_FACTOR_444
```
public static final int IMWRITE_JPEG_SAMPLING_FACTOR_444
```
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    Constant Field Values
  - IMWRITE_PAM_FORMAT_NULL
```
public static final int IMWRITE_PAM_FORMAT_NULL
```
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    Constant Field Values
  - IMWRITE_PAM_FORMAT_BLACKANDWHITE
```
public static final int IMWRITE_PAM_FORMAT_BLACKANDWHITE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_PAM_FORMAT_GRAYSCALE
```
public static final int IMWRITE_PAM_FORMAT_GRAYSCALE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA
```
public static final int IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA
```
    See Also:
    
    Constant Field Values
  - IMWRITE_PAM_FORMAT_RGB
```
public static final int IMWRITE_PAM_FORMAT_RGB
```
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    Constant Field Values
  - IMWRITE_PAM_FORMAT_RGB_ALPHA
```
public static final int IMWRITE_PAM_FORMAT_RGB_ALPHA
```
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    Constant Field Values
  - IMWRITE_PNG_STRATEGY_DEFAULT
```
public static final int IMWRITE_PNG_STRATEGY_DEFAULT
```
    See Also:
    
    Constant Field Values
  - IMWRITE_PNG_STRATEGY_FILTERED
```
public static final int IMWRITE_PNG_STRATEGY_FILTERED
```
    See Also:
    
    Constant Field Values
  - IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY
```
public static final int IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY
```
    See Also:
    
    Constant Field Values
  - IMWRITE_PNG_STRATEGY_RLE
```
public static final int IMWRITE_PNG_STRATEGY_RLE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_PNG_STRATEGY_FIXED
```
public static final int IMWRITE_PNG_STRATEGY_FIXED
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_NONE
```
public static final int IMWRITE_TIFF_COMPRESSION_NONE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_CCITTRLE
```
public static final int IMWRITE_TIFF_COMPRESSION_CCITTRLE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_CCITTFAX3
```
public static final int IMWRITE_TIFF_COMPRESSION_CCITTFAX3
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_CCITT_T4
```
public static final int IMWRITE_TIFF_COMPRESSION_CCITT_T4
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_CCITTFAX4
```
public static final int IMWRITE_TIFF_COMPRESSION_CCITTFAX4
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_CCITT_T6
```
public static final int IMWRITE_TIFF_COMPRESSION_CCITT_T6
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_LZW
```
public static final int IMWRITE_TIFF_COMPRESSION_LZW
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_OJPEG
```
public static final int IMWRITE_TIFF_COMPRESSION_OJPEG
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_JPEG
```
public static final int IMWRITE_TIFF_COMPRESSION_JPEG
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_T85
```
public static final int IMWRITE_TIFF_COMPRESSION_T85
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_T43
```
public static final int IMWRITE_TIFF_COMPRESSION_T43
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_NEXT
```
public static final int IMWRITE_TIFF_COMPRESSION_NEXT
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_CCITTRLEW
```
public static final int IMWRITE_TIFF_COMPRESSION_CCITTRLEW
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_PACKBITS
```
public static final int IMWRITE_TIFF_COMPRESSION_PACKBITS
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_THUNDERSCAN
```
public static final int IMWRITE_TIFF_COMPRESSION_THUNDERSCAN
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_IT8CTPAD
```
public static final int IMWRITE_TIFF_COMPRESSION_IT8CTPAD
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_IT8LW
```
public static final int IMWRITE_TIFF_COMPRESSION_IT8LW
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_IT8MP
```
public static final int IMWRITE_TIFF_COMPRESSION_IT8MP
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_IT8BL
```
public static final int IMWRITE_TIFF_COMPRESSION_IT8BL
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_PIXARFILM
```
public static final int IMWRITE_TIFF_COMPRESSION_PIXARFILM
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_PIXARLOG
```
public static final int IMWRITE_TIFF_COMPRESSION_PIXARLOG
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_DEFLATE
```
public static final int IMWRITE_TIFF_COMPRESSION_DEFLATE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_ADOBE_DEFLATE
```
public static final int IMWRITE_TIFF_COMPRESSION_ADOBE_DEFLATE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_DCS
```
public static final int IMWRITE_TIFF_COMPRESSION_DCS
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_JBIG
```
public static final int IMWRITE_TIFF_COMPRESSION_JBIG
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_SGILOG
```
public static final int IMWRITE_TIFF_COMPRESSION_SGILOG
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_SGILOG24
```
public static final int IMWRITE_TIFF_COMPRESSION_SGILOG24
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_JP2000
```
public static final int IMWRITE_TIFF_COMPRESSION_JP2000
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_LERC
```
public static final int IMWRITE_TIFF_COMPRESSION_LERC
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_LZMA
```
public static final int IMWRITE_TIFF_COMPRESSION_LZMA
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_ZSTD
```
public static final int IMWRITE_TIFF_COMPRESSION_ZSTD
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_WEBP
```
public static final int IMWRITE_TIFF_COMPRESSION_WEBP
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_COMPRESSION_JXL
```
public static final int IMWRITE_TIFF_COMPRESSION_JXL
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_PREDICTOR_NONE
```
public static final int IMWRITE_TIFF_PREDICTOR_NONE
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_PREDICTOR_HORIZONTAL
```
public static final int IMWRITE_TIFF_PREDICTOR_HORIZONTAL
```
    See Also:
    
    Constant Field Values
  - IMWRITE_TIFF_PREDICTOR_FLOATINGPOINT
```
public static final int IMWRITE_TIFF_PREDICTOR_FLOATINGPOINT
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Imgcodecs
```
public Imgcodecs()
```
- Method Detail
  - imread
```
public static Mat imread(String filename,
                         int flags)
```
    Loads an image from a file. imread The imread function loads an image from the specified file and returns OpenCV matrix. If the image cannot be read (because of a missing file, improper permissions, or unsupported/invalid format), the function returns an empty matrix. Currently, the following file formats are supported:
    - Windows bitmaps - \*.bmp, \*.dib (always supported)
    - GIF files - \*.gif (always supported)
    - JPEG files - \*.jpeg, \*.jpg, \*.jpe (see the *Note* section)
    - JPEG 2000 files - \*.jp2 (see the *Note* section)
    - Portable Network Graphics - \*.png (see the *Note* section)
    - WebP - \*.webp (see the *Note* section)
    - AVIF - \*.avif (see the *Note* section)
    - Portable image format - \*.pbm, \*.pgm, \*.ppm, \*.pxm, \*.pnm (always supported)
    - PFM files - \*.pfm (see the *Note* section)
    - Sun rasters - \*.sr, \*.ras (always supported)
    - TIFF files - \*.tiff, \*.tif (see the *Note* section)
    - OpenEXR Image files - \*.exr (see the *Note* section)
    - Radiance HDR - \*.hdr, \*.pic (always supported)
    - Raster and Vector geospatial data supported by GDAL (see the *Note* section)
    Note:
    - The function determines the type of an image by its content, not by the file extension.
    - In the case of color images, the decoded images will have the channels stored in B G R order.
    - When using IMREAD_GRAYSCALE, the codec's internal grayscale conversion will be used, if available. Results may differ from the output of cvtColor().
    - On Microsoft Windows\* and Mac OS\*, the codecs shipped with OpenCV (libjpeg, libpng, libtiff, and libjasper) are used by default. So, OpenCV can always read JPEGs, PNGs, and TIFFs. On Mac OS, there is also an option to use native Mac OS image readers. However, beware that currently these native image loaders give images with different pixel values because of the color management embedded into Mac OS.
    - On Linux\*, BSD flavors, and other Unix-like open-source operating systems, OpenCV looks for codecs supplied with the OS. Ensure the relevant packages are installed (including development files, such as "libjpeg-dev" in Debian\* and Ubuntu\*) to get codec support, or turn on the OPENCV_BUILD_3RDPARTY_LIBS flag in CMake.
    - If the *WITH_GDAL* flag is set to true in CMake and REF: IMREAD_LOAD_GDAL is used to load the image, the [GDAL](http://www.gdal.org) driver will be used to decode the image, supporting [Raster](http://www.gdal.org/formats_list.html) and [Vector](http://www.gdal.org/ogr_formats.html) formats.
    - If EXIF information is embedded in the image file, the EXIF orientation will be taken into account, and thus the image will be rotated accordingly unless the flags REF: IMREAD_IGNORE_ORIENTATION or REF: IMREAD_UNCHANGED are passed.
    - Use the IMREAD_UNCHANGED flag to preserve the floating-point values from PFM images.
    - By default, the number of pixels must be less than 2^30. This limit can be changed by setting the environment variable OPENCV_IO_MAX_IMAGE_PIXELS. See REF: tutorial_env_reference.
    Parameters:
    
    filename - Name of the file to be loaded.
    
    flags - Flag that can take values of cv::ImreadModes.
    
    Returns:
    
    automatically generated
  - imread
```
public static Mat imread(String filename)
```
    Loads an image from a file. imread The imread function loads an image from the specified file and returns OpenCV matrix. If the image cannot be read (because of a missing file, improper permissions, or unsupported/invalid format), the function returns an empty matrix. Currently, the following file formats are supported:
    - Windows bitmaps - \*.bmp, \*.dib (always supported)
    - GIF files - \*.gif (always supported)
    - JPEG files - \*.jpeg, \*.jpg, \*.jpe (see the *Note* section)
    - JPEG 2000 files - \*.jp2 (see the *Note* section)
    - Portable Network Graphics - \*.png (see the *Note* section)
    - WebP - \*.webp (see the *Note* section)
    - AVIF - \*.avif (see the *Note* section)
    - Portable image format - \*.pbm, \*.pgm, \*.ppm, \*.pxm, \*.pnm (always supported)
    - PFM files - \*.pfm (see the *Note* section)
    - Sun rasters - \*.sr, \*.ras (always supported)
    - TIFF files - \*.tiff, \*.tif (see the *Note* section)
    - OpenEXR Image files - \*.exr (see the *Note* section)
    - Radiance HDR - \*.hdr, \*.pic (always supported)
    - Raster and Vector geospatial data supported by GDAL (see the *Note* section)
    Note:
    - The function determines the type of an image by its content, not by the file extension.
    - In the case of color images, the decoded images will have the channels stored in B G R order.
    - When using IMREAD_GRAYSCALE, the codec's internal grayscale conversion will be used, if available. Results may differ from the output of cvtColor().
    - On Microsoft Windows\* and Mac OS\*, the codecs shipped with OpenCV (libjpeg, libpng, libtiff, and libjasper) are used by default. So, OpenCV can always read JPEGs, PNGs, and TIFFs. On Mac OS, there is also an option to use native Mac OS image readers. However, beware that currently these native image loaders give images with different pixel values because of the color management embedded into Mac OS.
    - On Linux\*, BSD flavors, and other Unix-like open-source operating systems, OpenCV looks for codecs supplied with the OS. Ensure the relevant packages are installed (including development files, such as "libjpeg-dev" in Debian\* and Ubuntu\*) to get codec support, or turn on the OPENCV_BUILD_3RDPARTY_LIBS flag in CMake.
    - If the *WITH_GDAL* flag is set to true in CMake and REF: IMREAD_LOAD_GDAL is used to load the image, the [GDAL](http://www.gdal.org) driver will be used to decode the image, supporting [Raster](http://www.gdal.org/formats_list.html) and [Vector](http://www.gdal.org/ogr_formats.html) formats.
    - If EXIF information is embedded in the image file, the EXIF orientation will be taken into account, and thus the image will be rotated accordingly unless the flags REF: IMREAD_IGNORE_ORIENTATION or REF: IMREAD_UNCHANGED are passed.
    - Use the IMREAD_UNCHANGED flag to preserve the floating-point values from PFM images.
    - By default, the number of pixels must be less than 2^30. This limit can be changed by setting the environment variable OPENCV_IO_MAX_IMAGE_PIXELS. See REF: tutorial_env_reference.
    Parameters:
    
    filename - Name of the file to be loaded.
    
    Returns:
    
    automatically generated
  - imread
```
public static void imread(String filename,
                          Mat dst,
                          int flags)
```
    Loads an image from a file. This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts and the return value.
    
    Parameters:
    
    filename - Name of file to be loaded.
    
    dst - object in which the image will be loaded.
    
    flags - Flag that can take values of cv::ImreadModes Note: The image passing through the img parameter can be pre-allocated. The memory is reused if the shape and the type match with the load image.
  - imread
```
public static void imread(String filename,
                          Mat dst)
```
    Loads an image from a file. This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts and the return value.
    
    Parameters:
    
    filename - Name of file to be loaded.
    
    dst - object in which the image will be loaded. Note: The image passing through the img parameter can be pre-allocated. The memory is reused if the shape and the type match with the load image.
  - imreadmulti
```
public static boolean imreadmulti(String filename,
                                  List<Mat> mats,
                                  int flags)
```
    Loads a multi-page image from a file. The function imreadmulti loads a multi-page image from the specified file into a vector of Mat objects.
    
    Parameters:
    
    filename - Name of file to be loaded.
    
    mats - A vector of Mat objects holding each page.
    
    flags - Flag that can take values of cv::ImreadModes, default with cv::IMREAD_ANYCOLOR. SEE: cv::imread
    
    Returns:
    
    automatically generated
  - imreadmulti
```
public static boolean imreadmulti(String filename,
                                  List<Mat> mats)
```
    Loads a multi-page image from a file. The function imreadmulti loads a multi-page image from the specified file into a vector of Mat objects.
    
    Parameters:
    
    filename - Name of file to be loaded.
    
    mats - A vector of Mat objects holding each page. SEE: cv::imread
    
    Returns:
    
    automatically generated
  - imreadmulti
```
public static boolean imreadmulti(String filename,
                                  List<Mat> mats,
                                  int start,
                                  int count,
                                  int flags)
```
    Loads images of a multi-page image from a file. The function imreadmulti loads a specified range from a multi-page image from the specified file into a vector of Mat objects.
    
    Parameters:
    
    filename - Name of file to be loaded.
    
    mats - A vector of Mat objects holding each page.
    
    start - Start index of the image to load
    
    count - Count number of images to load
    
    flags - Flag that can take values of cv::ImreadModes, default with cv::IMREAD_ANYCOLOR. SEE: cv::imread
    
    Returns:
    
    automatically generated
  - imreadmulti
```
public static boolean imreadmulti(String filename,
                                  List<Mat> mats,
                                  int start,
                                  int count)
```
    Loads images of a multi-page image from a file. The function imreadmulti loads a specified range from a multi-page image from the specified file into a vector of Mat objects.
    
    Parameters:
    
    filename - Name of file to be loaded.
    
    mats - A vector of Mat objects holding each page.
    
    start - Start index of the image to load
    
    count - Count number of images to load SEE: cv::imread
    
    Returns:
    
    automatically generated
  - imreadanimation
```
public static boolean imreadanimation(String filename,
                                      Animation animation,
                                      int start,
                                      int count)
```
    Loads frames from an animated image file into an Animation structure. The function imreadanimation loads frames from an animated image file (e.g., GIF, AVIF, APNG, WEBP) into the provided Animation struct.
    
    Parameters:
    
    filename - A string containing the path to the file.
    
    animation - A reference to an Animation structure where the loaded frames will be stored. It should be initialized before the function is called.
    
    start - The index of the first frame to load. This is optional and defaults to 0.
    
    count - The number of frames to load. This is optional and defaults to 32767.
    
    Returns:
    
    Returns true if the file was successfully loaded and frames were extracted; returns false otherwise.
  - imreadanimation
```
public static boolean imreadanimation(String filename,
                                      Animation animation,
                                      int start)
```
    Loads frames from an animated image file into an Animation structure. The function imreadanimation loads frames from an animated image file (e.g., GIF, AVIF, APNG, WEBP) into the provided Animation struct.
    
    Parameters:
    
    filename - A string containing the path to the file.
    
    animation - A reference to an Animation structure where the loaded frames will be stored. It should be initialized before the function is called.
    
    start - The index of the first frame to load. This is optional and defaults to 0.
    
    Returns:
    
    Returns true if the file was successfully loaded and frames were extracted; returns false otherwise.
  - imreadanimation
```
public static boolean imreadanimation(String filename,
                                      Animation animation)
```
    Loads frames from an animated image file into an Animation structure. The function imreadanimation loads frames from an animated image file (e.g., GIF, AVIF, APNG, WEBP) into the provided Animation struct.
    
    Parameters:
    
    filename - A string containing the path to the file.
    
    animation - A reference to an Animation structure where the loaded frames will be stored. It should be initialized before the function is called.
    
    Returns:
    
    Returns true if the file was successfully loaded and frames were extracted; returns false otherwise.
  - imwriteanimation
```
public static boolean imwriteanimation(String filename,
                                       Animation animation,
                                       MatOfInt params)
```
    Saves an Animation to a specified file. The function imwriteanimation saves the provided Animation data to the specified file in an animated format. Supported formats depend on the implementation and may include formats like GIF, AVIF, APNG, or WEBP.
    
    Parameters:
    
    filename - The name of the file where the animation will be saved. The file extension determines the format.
    
    animation - A constant reference to an Animation struct containing the frames and metadata to be saved.
    
    params - Optional format-specific parameters encoded as pairs (paramId_1, paramValue_1, paramId_2, paramValue_2, ...). These parameters are used to specify additional options for the encoding process. Refer to cv::ImwriteFlags for details on possible parameters.
    
    Returns:
    
    Returns true if the animation was successfully saved; returns false otherwise.
  - imwriteanimation
```
public static boolean imwriteanimation(String filename,
                                       Animation animation)
```
    Saves an Animation to a specified file. The function imwriteanimation saves the provided Animation data to the specified file in an animated format. Supported formats depend on the implementation and may include formats like GIF, AVIF, APNG, or WEBP.
    
    Parameters:
    
    filename - The name of the file where the animation will be saved. The file extension determines the format.
    
    animation - A constant reference to an Animation struct containing the frames and metadata to be saved. These parameters are used to specify additional options for the encoding process. Refer to cv::ImwriteFlags for details on possible parameters.
    
    Returns:
    
    Returns true if the animation was successfully saved; returns false otherwise.
  - imcount
```
public static long imcount(String filename,
                           int flags)
```
    Returns the number of images inside the given file The function imcount returns the number of pages in a multi-page image (e.g. TIFF), the number of frames in an animation (e.g. AVIF), and 1 otherwise. If the image cannot be decoded, 0 is returned.
    
    Parameters:
    
    filename - Name of file to be loaded.
    
    flags - Flag that can take values of cv::ImreadModes, default with cv::IMREAD_ANYCOLOR. TODO: when cv::IMREAD_LOAD_GDAL flag used the return value will be 0 or 1 because OpenCV's GDAL decoder doesn't support multi-page reading yet.
    
    Returns:
    
    automatically generated
  - imcount
```
public static long imcount(String filename)
```
    Returns the number of images inside the given file The function imcount returns the number of pages in a multi-page image (e.g. TIFF), the number of frames in an animation (e.g. AVIF), and 1 otherwise. If the image cannot be decoded, 0 is returned.
    
    Parameters:
    
    filename - Name of file to be loaded. TODO: when cv::IMREAD_LOAD_GDAL flag used the return value will be 0 or 1 because OpenCV's GDAL decoder doesn't support multi-page reading yet.
    
    Returns:
    
    automatically generated
  - imwrite
```
public static boolean imwrite(String filename,
                              Mat img,
                              MatOfInt params)
```
    Saves an image to a specified file. The function imwrite saves the image to the specified file. The image format is chosen based on the filename extension (see cv::imread for the list of extensions). In general, only 8-bit unsigned (CV_8U) single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function, with these exceptions:
    - With OpenEXR encoder, only 32-bit float (CV_32F) images can be saved.
      
      8-bit unsigned (CV_8U) images are not supported.
    - With Radiance HDR encoder, non 64-bit float (CV_64F) images can be saved.
      
      All images will be converted to 32-bit float (CV_32F).
    - With JPEG 2000 encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
    - With JPEG XL encoder, 8-bit unsigned (CV_8U), 16-bit unsigned (CV_16U) and 32-bit float(CV_32F) images can be saved.
      
      JPEG XL images with an alpha channel can be saved using this function. To do this, create 8-bit (or 16-bit, 32-bit float) 4-channel image BGRA, where the alpha channel goes last. Fully transparent pixels should have alpha set to 0, fully opaque pixels should have alpha set to 255/65535/1.0.
    - With PAM encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
    - With PNG encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
      
      PNG images with an alpha channel can be saved using this function. To do this, create 8-bit (or 16-bit) 4-channel image BGRA, where the alpha channel goes last. Fully transparent pixels should have alpha set to 0, fully opaque pixels should have alpha set to 255/65535 (see the code sample below).
    - With PGM/PPM encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
    - With TIFF encoder, 8-bit unsigned (CV_8U), 8-bit signed (CV_8S), 16-bit unsigned (CV_16U), 16-bit signed (CV_16S), 32-bit signed (CV_32S), 32-bit float (CV_32F) and 64-bit float (CV_64F) images can be saved.
      
      Multiple images (vector of Mat) can be saved in TIFF format (see the code sample below).
      
      32-bit float 3-channel (CV_32FC3) TIFF images will be saved using the LogLuv high dynamic range encoding (4 bytes per pixel)
      
      If the image format is not supported, the image will be converted to 8-bit unsigned (CV_8U) and saved that way.
    If the format, depth or channel order is different, use Mat::convertTo and cv::cvtColor to convert it before saving. Or, use the universal FileStorage I/O functions to save the image to XML or YAML format. The sample below shows how to create a BGRA image, how to set custom compression parameters and save it to a PNG file. It also demonstrates how to save multiple images in a TIFF file: INCLUDE: snippets/imgcodecs_imwrite.cpp
    Parameters:
    
    filename - Name of the file.
    
    img - (Mat or vector of Mat) Image or Images to be saved.
    
    params - Format-specific parameters encoded as pairs (paramId_1, paramValue_1, paramId_2, paramValue_2, ... .) see cv::ImwriteFlags
    
    Returns:
    
    automatically generated
  - imwrite
```
public static boolean imwrite(String filename,
                              Mat img)
```
    Saves an image to a specified file. The function imwrite saves the image to the specified file. The image format is chosen based on the filename extension (see cv::imread for the list of extensions). In general, only 8-bit unsigned (CV_8U) single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function, with these exceptions:
    - With OpenEXR encoder, only 32-bit float (CV_32F) images can be saved.
      
      8-bit unsigned (CV_8U) images are not supported.
    - With Radiance HDR encoder, non 64-bit float (CV_64F) images can be saved.
      
      All images will be converted to 32-bit float (CV_32F).
    - With JPEG 2000 encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
    - With JPEG XL encoder, 8-bit unsigned (CV_8U), 16-bit unsigned (CV_16U) and 32-bit float(CV_32F) images can be saved.
      
      JPEG XL images with an alpha channel can be saved using this function. To do this, create 8-bit (or 16-bit, 32-bit float) 4-channel image BGRA, where the alpha channel goes last. Fully transparent pixels should have alpha set to 0, fully opaque pixels should have alpha set to 255/65535/1.0.
    - With PAM encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
    - With PNG encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
      
      PNG images with an alpha channel can be saved using this function. To do this, create 8-bit (or 16-bit) 4-channel image BGRA, where the alpha channel goes last. Fully transparent pixels should have alpha set to 0, fully opaque pixels should have alpha set to 255/65535 (see the code sample below).
    - With PGM/PPM encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
    - With TIFF encoder, 8-bit unsigned (CV_8U), 8-bit signed (CV_8S), 16-bit unsigned (CV_16U), 16-bit signed (CV_16S), 32-bit signed (CV_32S), 32-bit float (CV_32F) and 64-bit float (CV_64F) images can be saved.
      
      Multiple images (vector of Mat) can be saved in TIFF format (see the code sample below).
      
      32-bit float 3-channel (CV_32FC3) TIFF images will be saved using the LogLuv high dynamic range encoding (4 bytes per pixel)
      
      If the image format is not supported, the image will be converted to 8-bit unsigned (CV_8U) and saved that way.
    If the format, depth or channel order is different, use Mat::convertTo and cv::cvtColor to convert it before saving. Or, use the universal FileStorage I/O functions to save the image to XML or YAML format. The sample below shows how to create a BGRA image, how to set custom compression parameters and save it to a PNG file. It also demonstrates how to save multiple images in a TIFF file: INCLUDE: snippets/imgcodecs_imwrite.cpp
    Parameters:
    
    filename - Name of the file.
    
    img - (Mat or vector of Mat) Image or Images to be saved.
    
    Returns:
    
    automatically generated
  - imwritemulti
```
public static boolean imwritemulti(String filename,
                                   List<Mat> img,
                                   MatOfInt params)
```
  - imwritemulti
```
public static boolean imwritemulti(String filename,
                                   List<Mat> img)
```
  - imdecode
```
public static Mat imdecode(Mat buf,
                           int flags)
```
    Reads an image from a buffer in memory. The function imdecode reads an image from the specified buffer in the memory. If the buffer is too short or contains invalid data, the function returns an empty matrix ( Mat::data==NULL ). See cv::imread for the list of supported formats and flags description. Note: In the case of color images, the decoded images will have the channels stored in B G R order.
    
    Parameters:
    
    buf - Input array or vector of bytes.
    
    flags - The same flags as in cv::imread, see cv::ImreadModes.
    
    Returns:
    
    automatically generated
  - imdecodemulti
```
public static boolean imdecodemulti(Mat buf,
                                    int flags,
                                    List<Mat> mats,
                                    Range range)
```
    Reads a multi-page image from a buffer in memory. The function imdecodemulti reads a multi-page image from the specified buffer in the memory. If the buffer is too short or contains invalid data, the function returns false. See cv::imreadmulti for the list of supported formats and flags description. Note: In the case of color images, the decoded images will have the channels stored in B G R order.
    
    Parameters:
    
    buf - Input array or vector of bytes.
    
    flags - The same flags as in cv::imread, see cv::ImreadModes.
    
    mats - A vector of Mat objects holding each page, if more than one.
    
    range - A continuous selection of pages.
    
    Returns:
    
    automatically generated
  - imdecodemulti
```
public static boolean imdecodemulti(Mat buf,
                                    int flags,
                                    List<Mat> mats)
```
    Reads a multi-page image from a buffer in memory. The function imdecodemulti reads a multi-page image from the specified buffer in the memory. If the buffer is too short or contains invalid data, the function returns false. See cv::imreadmulti for the list of supported formats and flags description. Note: In the case of color images, the decoded images will have the channels stored in B G R order.
    
    Parameters:
    
    buf - Input array or vector of bytes.
    
    flags - The same flags as in cv::imread, see cv::ImreadModes.
    
    mats - A vector of Mat objects holding each page, if more than one.
    
    Returns:
    
    automatically generated
  - imencode
```
public static boolean imencode(String ext,
                               Mat img,
                               MatOfByte buf,
                               MatOfInt params)
```
    Encodes an image into a memory buffer. The function imencode compresses the image and stores it in the memory buffer that is resized to fit the result. See cv::imwrite for the list of supported formats and flags description.
    
    Parameters:
    
    ext - File extension that defines the output format. Must include a leading period.
    
    img - Image to be compressed.
    
    buf - Output buffer resized to fit the compressed image.
    
    params - Format-specific parameters. See cv::imwrite and cv::ImwriteFlags.
    
    Returns:
    
    automatically generated
  - imencode
```
public static boolean imencode(String ext,
                               Mat img,
                               MatOfByte buf)
```
    Encodes an image into a memory buffer. The function imencode compresses the image and stores it in the memory buffer that is resized to fit the result. See cv::imwrite for the list of supported formats and flags description.
    
    Parameters:
    
    ext - File extension that defines the output format. Must include a leading period.
    
    img - Image to be compressed.
    
    buf - Output buffer resized to fit the compressed image.
    
    Returns:
    
    automatically generated
  - imencodemulti
```
public static boolean imencodemulti(String ext,
                                    List<Mat> imgs,
                                    MatOfByte buf,
                                    MatOfInt params)
```
    Encodes array of images into a memory buffer. The function is analog to cv::imencode for in-memory multi-page image compression. See cv::imwrite for the list of supported formats and flags description.
    
    Parameters:
    
    ext - File extension that defines the output format. Must include a leading period.
    
    imgs - Vector of images to be written.
    
    buf - Output buffer resized to fit the compressed data.
    
    params - Format-specific parameters. See cv::imwrite and cv::ImwriteFlags.
    
    Returns:
    
    automatically generated
  - imencodemulti
```
public static boolean imencodemulti(String ext,
                                    List<Mat> imgs,
                                    MatOfByte buf)
```
    Encodes array of images into a memory buffer. The function is analog to cv::imencode for in-memory multi-page image compression. See cv::imwrite for the list of supported formats and flags description.
    
    Parameters:
    
    ext - File extension that defines the output format. Must include a leading period.
    
    imgs - Vector of images to be written.
    
    buf - Output buffer resized to fit the compressed data.
    
    Returns:
    
    automatically generated
  - haveImageReader
```
public static boolean haveImageReader(String filename)
```
    Checks if the specified image file can be decoded by OpenCV. The function haveImageReader checks if OpenCV is capable of reading the specified file. This can be useful for verifying support for a given image format before attempting to load an image.
    
    Parameters:
    
    filename - The name of the file to be checked.
    
    Returns:
    
    true if an image reader for the specified file is available and the file can be opened, false otherwise. Note: The function checks the availability of image codecs that are either built into OpenCV or dynamically loaded. It does not check for the actual existence of the file but rather the ability to read the specified file type. If the file cannot be opened or the format is unsupported, the function will return false. SEE: cv::haveImageWriter, cv::imread, cv::imdecode
  - haveImageWriter
```
public static boolean haveImageWriter(String filename)
```
    Checks if the specified image file or specified file extension can be encoded by OpenCV. The function haveImageWriter checks if OpenCV is capable of writing images with the specified file extension. This can be useful for verifying support for a given image format before attempting to save an image.
    
    Parameters:
    
    filename - The name of the file or the file extension (e.g., ".jpg", ".png"). It is recommended to provide the file extension rather than the full file name.
    
    Returns:
    
    true if an image writer for the specified extension is available, false otherwise. Note: The function checks the availability of image codecs that are either built into OpenCV or dynamically loaded. It does not check for the actual existence of the file but rather the ability to write files of the given type. SEE: cv::haveImageReader, cv::imwrite, cv::imencode

Class Imgcodecs

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

IMREAD_UNCHANGED

IMREAD_GRAYSCALE

IMREAD_COLOR_BGR

IMREAD_COLOR

IMREAD_ANYDEPTH

IMREAD_ANYCOLOR

IMREAD_LOAD_GDAL

IMREAD_REDUCED_GRAYSCALE_2

IMREAD_REDUCED_COLOR_2

IMREAD_REDUCED_GRAYSCALE_4

IMREAD_REDUCED_COLOR_4

IMREAD_REDUCED_GRAYSCALE_8

IMREAD_REDUCED_COLOR_8

IMREAD_IGNORE_ORIENTATION

IMREAD_COLOR_RGB

IMWRITE_EXR_COMPRESSION_NO

IMWRITE_EXR_COMPRESSION_RLE

IMWRITE_EXR_COMPRESSION_ZIPS

IMWRITE_EXR_COMPRESSION_ZIP

IMWRITE_EXR_COMPRESSION_PIZ

IMWRITE_EXR_COMPRESSION_PXR24

IMWRITE_EXR_COMPRESSION_B44

IMWRITE_EXR_COMPRESSION_B44A

IMWRITE_EXR_COMPRESSION_DWAA

IMWRITE_EXR_COMPRESSION_DWAB

IMWRITE_EXR_TYPE_HALF

IMWRITE_EXR_TYPE_FLOAT

IMWRITE_JPEG_QUALITY

IMWRITE_JPEG_PROGRESSIVE

IMWRITE_JPEG_OPTIMIZE

IMWRITE_JPEG_RST_INTERVAL

IMWRITE_JPEG_LUMA_QUALITY

IMWRITE_JPEG_CHROMA_QUALITY

IMWRITE_JPEG_SAMPLING_FACTOR

IMWRITE_PNG_COMPRESSION

IMWRITE_PNG_STRATEGY

IMWRITE_PNG_BILEVEL

IMWRITE_PXM_BINARY

IMWRITE_EXR_TYPE

IMWRITE_EXR_COMPRESSION

IMWRITE_EXR_DWA_COMPRESSION_LEVEL

IMWRITE_WEBP_QUALITY

IMWRITE_HDR_COMPRESSION

IMWRITE_PAM_TUPLETYPE

IMWRITE_TIFF_RESUNIT

IMWRITE_TIFF_XDPI

IMWRITE_TIFF_YDPI

IMWRITE_TIFF_COMPRESSION

IMWRITE_TIFF_ROWSPERSTRIP

IMWRITE_TIFF_PREDICTOR

IMWRITE_JPEG2000_COMPRESSION_X1000

IMWRITE_AVIF_QUALITY

IMWRITE_AVIF_DEPTH

IMWRITE_AVIF_SPEED

IMWRITE_JPEGXL_QUALITY

IMWRITE_JPEGXL_EFFORT

IMWRITE_JPEGXL_DISTANCE

IMWRITE_JPEGXL_DECODING_SPEED

IMWRITE_GIF_LOOP

IMWRITE_GIF_SPEED

IMWRITE_GIF_QUALITY

IMWRITE_GIF_DITHER

IMWRITE_GIF_TRANSPARENCY

IMWRITE_GIF_COLORTABLE

IMWRITE_GIF_FAST_NO_DITHER

IMWRITE_GIF_FAST_FLOYD_DITHER

IMWRITE_GIF_COLORTABLE_SIZE_8

IMWRITE_GIF_COLORTABLE_SIZE_16

IMWRITE_GIF_COLORTABLE_SIZE_32

IMWRITE_GIF_COLORTABLE_SIZE_64

IMWRITE_GIF_COLORTABLE_SIZE_128

IMWRITE_GIF_COLORTABLE_SIZE_256

IMWRITE_HDR_COMPRESSION_NONE

IMWRITE_HDR_COMPRESSION_RLE