Table of Contents

Enum ImwriteFlags

Namespace
OpenCvSharp
Assembly
OpenCvSharp.dll

The format type IDs for cv::imwrite and cv::inencode

public enum ImwriteFlags

Fields

AvifDepth = 513

For AVIF, it can be 8, 10 or 12. If >8, it is stored/read as CV_16U. Default is 8.

AvifQuality = 512

For AVIF, it can be a quality between 0 and 100 (the higher the better). Default is 95.

AvifSpeed = 514

For AVIF, it is between 0 (slowest) and 10 (fastest). Default is 9.

BmpCompression = 768

For BMP, use to specify compress parameter for 32bpp image. Default is IMWRITE_BMP_COMPRESSION_BITFIELDS. See cv::ImwriteBMPCompressionFlags.

ExrCompression = 49

[49] override EXR compression type (ZIP_COMPRESSION = 3 is default)

ExrDwaCompressionLevel = 50

[50] override EXR DWA compression level (45 is default)

ExrType = 48

[48] override EXR storage type (FLOAT (FP32) is default)

GifColorTable = 1029

For GIF, 0 means global color table is used, 1 means local color table is used. Default is 0.

GifDither = 1027

For GIF, it can be a quality from -1 (most dither) to 3 (no dither). Default is 0.

GifLoop = 1024

Not functional since 4.12.0. Replaced by cv::Animation::loop_count.

GifQuality = 1026

For GIF, it can be a quality from 1 to 8. Default is 2. See cv::ImwriteGIFCompressionFlags.

GifSpeed = 1025

Not functional since 4.12.0. Replaced by cv::Animation::durations.

GifTransparency = 1028

For GIF, the alpha channel lower than this will be set to transparent. Default is 1.

HdrCompression = 80

[80] Specify HDR compression. See cv::ImwriteHDRCompressionFlags.

Jpeg2000CompressionX1000 = 272

For JPEG2000, use to specify the target compression rate (multiplied by 1000). The value can be from 0 to 1000. Default is 1000.

JpegChromaQuality = 6

Separate chroma quality level, 0 - 100, default is 0 - don't use.

JpegLumaQuality = 5

Separate luma quality level, 0 - 100, default is 0 - don't use.

JpegOptimize = 3

Enable JPEG features, 0 or 1, default is False.

JpegProgressive = 2

Enable JPEG features, 0 or 1, default is False.

JpegQuality = 1

For JPEG, it can be a quality from 0 to 100 (the higher is the better). Default value is 95.

JpegRstInterval = 4

JPEG restart interval, 0 - 65535, default is 0 - no restart.

JpegSamplingFactor = 7

For JPEG, set sampling factor. See cv::ImwriteJPEGSamplingFactorParams.

JpegXlDecodingSpeed = 643

For JPEG XL, decoding speed tier for the provided options; minimum is 0 (slowest to decode, best quality/density), and maximum is 4 (fastest to decode, at the cost of some quality/density). Default is 0.

JpegXlDistance = 642

For JPEG XL, distance level for lossy compression: target max butteraugli distance, lower = higher quality, 0 = lossless; range: 0..25. Default is 1.

JpegXlEffort = 641

For JPEG XL, encoder effort/speed level without affecting decoding speed; it is between 1 (fastest) and 10 (slowest). Default is 7.

JpegXlQuality = 640

For JPEG XL, it can be a quality from 0 to 100 (the higher is the better). Default value is 95. If set, distance parameter is re-calculated from quality level automatically. This parameter requires libjxl v0.10 or later.

PamTupleType = 128

For PAM, sets the TUPLETYPE field to the corresponding string value that is defined for the format

PngBilevel = 18

Binary level PNG, 0 or 1, default is 0.

PngCompression = 16

For PNG, it can be the compression level from 0 to 9. A higher value means a smaller size and longer compression time. Default value is 3.

PngFilter = 19

For PNG, One of cv::ImwritePNGFilterFlags, default is IMWRITE_PNG_FILTER_SUB. For APNG, it is not supported.

PngStrategy = 17

One of cv::ImwritePNGFlags, default is IMWRITE_PNG_StrategyDEFAULT.

PngZlibBufferSize = 20

For PNG with libpng, sets the size of the internal zlib compression buffer in bytes, from 6 to 1048576 (1024 KiB). Default is 8192 (8 KiB). If WITH_SPNG=ON, it is not supported. For APNG, it is not supported.

PxmBinary = 32

For PPM, PGM, or PBM, it can be a binary format flag, 0 or 1. Default value is 1.

TiffCompression = 259

For TIFF, use to specify the image compression scheme. See libtiff for integer constants corresponding to compression formats. 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.

TiffPredictor = 317

For TIFF, use to specify predictor. See cv::ImwriteTiffPredictorFlags. Default is IMWRITE_TIFF_PREDICTOR_HORIZONTAL.

TiffResUnit = 256

For TIFF, use to specify which DPI resolution unit to set; see libtiff documentation for valid values

TiffRowsPerStrip = 278

For TIFF, use to specify the number of rows per strip.

TiffXDpi = 257

For TIFF, use to specify the X direction DPI

TiffYDpi = 258

For TIFF, use to specify the Y direction DPI

WebPLosslessMode = 65

For WEBP, it can be a lossless compression strategy. See cv::ImwriteWEBPLosslessMode. Default is IMWRITE_WEBP_LOSSLESS_OFF. For Animated WEBP, it is not supported.

WebPQuality = 64

For WEBP, it can be a lossy quality from 1 to 100 (the higher is the better) for IMWRITE_WEBP_LOSSLESS_OFF. By default (without this parameter) or if quality > 100, lossless compression is used instead.

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