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Optimizers (like pngcrush and optipng) optimize the compression, usually losslessly. pngnq quantizes colors down to 256 (or fewer) distinct RGBA combinations, which is quite lossy. Optimized PNGs are usually two to four times smaller than the 32-bit versions.
PNGNQ - PNG NEUQUANT VERSION 0.5 USAGE: pngnq [-vfhV][-s sample factor][-e extension][-d dir][-n colours][-Q f|n][input files] options: -v Verbose mode. Prints status messages. -f Force ovewriting of files. -s Sample factor. The neuquant algorithm samples pixels stepping by this value. -n Number of colours the quantized image is to contain. Range: 2 to 256. Defaults to 2 more»
PNGNQ Release Notes 1.0 - Added PorneL's improvements. These include dithering, gamma correction. Checked with pngsuite images. Cleaned up error reporting a bit.
PNGCOMP(1) PNGCOMP(1) NAME pngcomp - PNG (Portable Network Graphics) comparison tool SYNOPSIS pngcomp [-vVh] image1.png image2.png DESCRIPTION pngcomp gives some basic statistics about the difference between two images. It was created as a measure of various color quantization methods. OPTIONS -v more»
PNGNQ(1) User Manuals PNGNQ(1) NAME pngnq - quantiz more»
pngnq (1.0-2+b1) sid; urgency=low * Binary-only non-maintainer upload for hurd-i386; no source ch more»
May 2009: Version 1.0 release. Moved to using Kornel Lesiński's codebase. Many changes more»
This package was debianized by Nelson A. de Oliveira <email@example.com> on Tue, 11 Oct 2005 22:50:49 more»