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PNGQUANT

NAME

pngquant − PNG image optimising utility

SYNOPSIS

pngquant [ options ] <ncolors> [pngfile [pngfile ...]]
pngquant
[ options ] −map mapfile [pngfile [pngfile ...]]

Note that it’s required to specify the number of colors (<ncolors>) or the mapfile. Arguments in square brackets are optional.

DESCRIPTION

This manual page documents briefly the pngquant command.

pngquant quantizes one or more 32-bit RGBA PNGs to 8-bit (or smaller) RGBA-palette PNGs using either ordered dithering or Floyd-Steinberg diffusion dithering (default). 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 image will go to stdout). The default behavior if the output file exists is to skip the conversion; use -force to overwrite.

OPTIONS

−force

Overwrite existing output files.

−ordened, −nofloyd, −nofs

Use ordered dithering.

−verbose, −noquiet

Print status messages.

NOTE:

the −map option is NOT YET SUPPORTED.

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
.

AUTHOR

pngquant was written by Greg Roelofs <newt AT pobox DOT com>.

This manual page was written by Nelson A. de Oliveira <naoliv AT debian DOT org>, for the Debian project (but may be used by others).

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