pngnq − quantize png images
pngnq [-vfhV][-s sample_factor ][-e extension ][-d dir ][-n colors ][ inputfiles ]
pngnq quantizes a 32-bit RGBA PNG image to an 8 bit RGBA palette PNG using the neuquant algorithm. The output file name is the input file name extended with "−nq8.png" or a specified extension.
-v |
Verbose mode. Prints status messages. |
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-f |
Force overwriting of files. |
-s sample factor
Sample factor. The neuquant algorithm samples pixels stepping by this value. The default value of 3 gives good results. Higher values sample less of the image pixels and thus are faster but less accurate. A factor of 1 samples every image pixel.
-n colors
Specifies the number of colors to quantize to. Defaults to 256 which is the maximum. The minimum here is 2.
-e extension
Specifies the new filename extension. Defaults to "−nq8.png". Pngnq drops .png from the original filenames. If you set the argument of the −e option to .png and choose the −f option the input file will be overwritten.
-d dir |
Tells pngnq to put output files in a directory other than the one the input files are in. |
input files
The png files to be processed. Defaults to standard input if not specified. If standard input is being processed the output is sent to standard output.
-h |
Print program help. |
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-V |
Print version number and library versions. |
None known at this time.
Stuart Coyle <stuart AT cybertherial DOT com>