If set, the image is read in any possible color format.
If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.
If set, always convert image to the 3 channel BGR color image.
If set, always convert image to the single channel grayscale image (codec internal conversion).
If set, do not rotate the image according to EXIF’s orientation flag.
If set, use the gdal driver for loading the image.
If set, always convert image to the 3 channel BGR color image and the image size reduced 1/2.
If set, always convert image to the 3 channel BGR color image and the image size reduced 1/4.
If set, always convert image to the 3 channel BGR color image and the image size reduced 1/8.
If set, always convert image to the single channel grayscale image and the image size reduced 1/2.
If set, always convert image to the single channel grayscale image and the image size reduced 1/4.
If set, always convert image to the single channel grayscale image and the image size reduced 1/8.
If set, return the loaded image as is (with alpha channel, otherwise it gets cropped). Ignore EXIF orientation.
For AVIF, it can be 8, 10 or 12. If >8, it is stored/read as CV_32F. Default is 8.
For AVIF, it can be a quality between 0 and 100 (the higher the better). Default is 95.
For AVIF, it is between 0 (slowest) and (fastest). Default is 9.
override EXR compression type (ZIP_COMPRESSION = 3 is default)
lossy 4-by-4 pixel block compression, fixed compression rate
lossy 4-by-4 pixel block compression, flat fields are compressed more
lossy DCT based compression, in blocks of 32 scanlines. More efficient for partial buffer access. Supported since OpenEXR 2.2.0.
lossy DCT based compression, in blocks of 256 scanlines. More efficient space wise and faster to decode full frames than DWAA_COMPRESSION. Supported since OpenEXR 2.2.0.
no compression
piz-based wavelet compression
lossy 24-bit float compression
run length encoding
zlib compression, in blocks of 16 scan lines
zlib compression, one scan line at a time
override EXR DWA compression level (45 is default)
override EXR storage type (FLOAT (FP32) is default)
store as FP32 (default)
store as HALF (FP16)
specify HDR compression
For JPEG2000, use to specify the target compression rate (multiplied by 1000). The value can be from 0 to 1000. Default is 1000.
Separate chroma quality level, 0 - 100, default is -1 - don’t use. If JPEG_LIB_VERSION < 70, Not supported.
Separate luma quality level, 0 - 100, default is -1 - don’t use. If JPEG_LIB_VERSION < 70, Not supported.
Enable JPEG features, 0 or 1, default is False.
Enable JPEG features, 0 or 1, default is False.
For JPEG, it can be a quality from 0 to 100 (the higher is the better). Default value is 95.
JPEG restart interval, 0 - 65535, default is 0 - no restart.
For JPEG, set sampling factor. See cv::ImwriteJPEGSamplingFactorParams.
4x1,1x1,1x1
2x2,1x1,1x1(Default)
2x1,1x1,1x1
1x2,1x1,1x1
1x1,1x1,1x1(No subsampling)
For PAM, sets the TUPLETYPE field to the corresponding string value that is defined for the format
Binary level PNG, 0 or 1, default is 0.
For PNG, it can be the compression level from 0 to 9. A higher value means a smaller size and longer compression time. If specified, strategy is changed to IMWRITE_PNG_STRATEGY_DEFAULT (Z_DEFAULT_STRATEGY). Default value is 1 (best speed setting).
One of cv::ImwritePNGFlags, default is IMWRITE_PNG_STRATEGY_RLE.
Use this value for normal data.
Use this value for data produced by a filter (or predictor).Filtered data consists mostly of small values with a somewhat random distribution. In this case, the compression algorithm is tuned to compress them better.
Using this value prevents the use of dynamic Huffman codes, allowing for a simpler decoder for special applications.
Use this value to force Huffman encoding only (no string match).
Use this value to limit match distances to one (run-length encoding).
For PPM, PGM, or PBM, it can be a binary format flag, 0 or 1. Default value is 1.
For TIFF, use to specify the image compression scheme. See cv::ImwriteTiffCompressionFlags. Note, for images whose depth is CV_32F, only libtiff’s SGILOG compression scheme is used. For other supported depths, the compression scheme can be specified by this flag; LZW compression is the default.
Deflate compression, as recognized by Adobe
CCITT Group 3 fax encoding
CCITT Group 4 fax encoding
CCITT modified Huffman RLE
[1] w/ word alignment
CCITT T.4 (TIFF 6 name)
CCITT T.6 (TIFF 6 name)
Kodak DCS encoding
Deflate compression, legacy tag
IT8 Binary line art
IT8 CT w/padding
IT8 Linework RLE
IT8 Monochrome picture
ISO JBIG
Leadtools JPEG2000
%JPEG DCT compression
JPEGXL: WARNING not registered in Adobe-maintained registry
LZMA2
Lempel-Ziv & Welch
NeXT 2-bit RLE
dump mode
!6.0 JPEG
Macintosh RLE
Pixar companded 10bit LZW
Pixar companded 11bit ZIP
SGI Log Luminance RLE
SGI Log 24-bit packed
!TIFF/FX T.43 colour by layered JBIG compression
!TIFF/FX T.85 JBIG compression
ThunderScan RLE
WEBP: WARNING not registered in Adobe-maintained registry
ZSTD: WARNING not registered in Adobe-maintained registry
For TIFF, use to specify predictor. See cv::ImwriteTiffPredictorFlags.
floating point predictor
horizontal differencing
no prediction scheme used
For TIFF, use to specify which DPI resolution unit to set; see libtiff documentation for valid values
For TIFF, use to specify the number of rows per strip.
For TIFF, use to specify the X direction DPI
For TIFF, use to specify the Y direction DPI
For WEBP, it can be a quality from 1 to 100 (the higher is the better). By default (without any parameter) and for quality above 100 the lossless compression is used.
Returns true if the specified image can be decoded by OpenCV
Returns true if an image with the specified filename can be encoded by OpenCV
Returns the number of images inside the give file
Returns the number of images inside the give file
Reads an image from a buffer in memory.
Reads an image from a buffer in memory.
Reads a multi-page image from a buffer in memory.
Reads a multi-page image from a buffer in memory.
Encodes an image into a memory buffer.
Encodes an image into a memory buffer.
Loads an image from a file.
Loads an image from a file.
Loads an image from a file.
Loads an image from a file.
Loads a multi-page image from a file.
Loads a multi-page image from a file.
Loads a of images of a multi-page image from a file.
Loads a of images of a multi-page image from a file.
Saves an image to a specified file.
Saves an image to a specified file.
multi-image overload for bindings
multi-image overload for bindings