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NAME pngquant -- PNG converter and lossy image compressor SYNOPSIS pngquant <options> [ncolors] file [file ...] pngquant <options> [ncolors] - <file >file DESCRIPTION pngquant converts 32-bit RGBA PNGs to 8-bit (or smaller) RGBA-palette PNGs, optionally using Floyd-Steinberg dithering. The output filename is the same as the input name except that it ends in `-fs8.png' or `-or8.png' (unless the input is stdin, in which case the quantized im- age will go to stdout). The default behavior if the output file exists is to skip the conversion; use --force to overwrite. OPTIONS -o out.png, --output out.png Writes converted file to the given path. When this option is used only single input file is allowed. --ext new.png File extension (suffix) to use for output files instead of the default `-fs8.png' or `-or8.png'. -f, --force Overwrite existing output files. "--ext .png --force" can be used to convert files in place (which is unsafe). --nofs, --ordered Disable Floyd-Steinberg dithering. --floyd [=N] Set dithering level using fractional number between 0 (none) and 1 (full, the default). -s N, --speed N 1 (brute-force) to 11 (fastest). The default is 3. Speed 10 has 5% lower quality, but is about 8 times faster than the de- fault. Speed 11 disables dithering and lowers compression level. -Q min-max, --quality min-max min and max are numbers in range 0 (worst) to 100 (perfect), similar to JPEG. pngquant will use the least amount of colors required to meet or exceed the max quality. If conversion re- sults in quality below the min quality the image won't be saved (or if outputting to stdin, 24-bit original will be out- put) and pngquant will exit with status code 99. --skip-if-larger If conversion results in a file larger than the original, the image won't be saved and pngquant will exit with status code 98. Additionally, file size gain must be greater than the amount of quality lost. If quality drops by 50%, it will ex- pect 50% file size reduction to consider it worthwhile. --posterize bits Truncate number of least significant bits of color (per chan- nel). Use this when image will be output on low-depth displays (e.g. 16-bit RGB). pngquant will make almost-opaque pixels fully opaque and will reduce amount of semi-transparent col- ors. When this option is enabled the default filename suffix is `-ie-fs8.png' / `-ie-or8.png'. --strip Remove optional chunks (metadata) from PNG files. --transbug Workaround for readers that expect fully transparent color to be the last entry in the palette. -v, --verbose Enable verbose messages showing progress and information about input/output. Opposite is --quiet. Errors are output to stderr regardless of this option. -V, --version Display version on stdout and exit. -h, --help Display help and exit. EXAMPLE Creating a new image with the number of colors reduced to 64: pngquant 64 image.png The resulting image will have 64 colors and will be saved as image-fs8.png. Overwriting image in-place if it can be reduced without too much qual- ity loss: pngquant -f --ext .png --quality 70-95 image.png AUTHOR pngquant is developed by Kornel Lesinski <kornel@pngquant.org> based on code by Greg Roelofs <newt@pobox.com>. pngquant homepage: https://pngquant.org. 2013-02-25 pngquant(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLE | AUTHOR
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