set gamma 1.7, -set reference-black 95, -set reference-white 685). Use -set to specify the image gamma or black and white points (e.g.
Imagemagick compress archive#
Standard blueprint archive format as used by the US military to replace microfiche. Uses juxtaposition of 6-dot braille patterns (thus 6x2 dot matrices) to reproduce images, using the BRF ASCII Braille encoding.Ĭontinuous Acquisition and Life-cycle Support Type 1 image Use -define bmp:ignore-filesize to ignore the filesize check. Use BMP3 and BMP2 to write versions 3 and 2 respectively. quality 92 assigns 46 as the BPG compression.īy default the BMP format is version 4. To meet the requirements of BPG, the quality argument divided by 2 (e.g.
Use -quality to specify the image compression quality. For signed pixel data, use -define quantum:format=signed. Set the depth to 32 for single precision floats, 64 for double precision, and 16 for half-precision. To specify a single precision floating-point format, use -define quantum:format=floating-point. Use -size and -depth to specify the image width, height, and depth. You can also set these options: use-auto-wb, use-auto-bright, and output-color.įormat derived from the keyframes of AV1 video Set -define dng:use-camera-wb=true to use the RAW-embedded color profile for Sony cameras. Sony Digital Camera Alpha Raw Image Format Note, you must use an explicit image format specifier to read an APNG ( apng:myImage.apng) image sequence, otherwise it assumes a PNG image and only reads the first frame.įormat originally used on the Macintosh (MacPaint?) and later used for PFS: 1st Publisher clip art. The following table provides a summary of ImageMagick supports reading over 100 major file formats (not magick lab.tif -resize 50% resize.jpgĪgain, it may not make sense for some image processing operators to workĭirectly in LAB space, but ImageMagick permits it and generally returns Essentially the A andī channels are stored with a 50% gray bias, to allow it to handle the
ForĮxample, magick image.jpg -colorspace RGB -resize 50% -colorspace sRGB resize.jpgĪs of IM 6.7.8-2 one can properly work in LAB colorspace whether or not Results in linear RGB (essentially sRGB with the gamma function removed). Satisfactory results processing in the sRGB colorspace, you may get improved Processing algorithms assume a linear RGB colorspace. When processing an image, be aware of the colorspace. This command: $ magick identify -verbose image.jpgįormat: JPEG (Joint Photographic Experts Group JFIF format)
To determine the colorspace of your image, use Then there is the occasional format that also supports LAB (that is CieLAB) EXR,ĭPX, CIN, HDR) or only linear GRAY (e.g. A Word about ColorspacesĪ majority of the image formats assume an sRGBĬolorspace (e.g. For example, a PNM image called is automagically uncompressed.
On some platforms, ImageMagick automagically processes these extensions. To get a complete listing of which image formats are supported on your system, type magick identify -list format The Installation Guide describes where to find these distributions and any special configuration options required. Support for some of the formats are delegated to libraries or external programs. GIF) to identify file formats, algorithms acting as formats, built-in patterns, and embedded profile types. ImageMagick uses an ASCII string known as magick (e.g.
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