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pngquant is a command-line* utility to quantize and dither 32-bit RGBA PNGs down to 8-bit (or smaller) RGBA-palette PNGs, usually with a significant reduction in file size. (Other PNG image types, even colormapped images, may also be processed, but they will first be expanded to RGBA, which isn't the most efficient way to do so.) This is the same technique used for many of the images on the Miscel
Portable Network Graphics (PNG) Specification and Extensions The original specification for PNG, version 1.0, was written by Thomas Boutell and Tom Lane, with contributions by many others. On 1 October 1996 it was released by the W3C as its first Recommendation, and on 15 January 1997 it was released by the IETF as RFC 2083. Version 1.1 of the spec included a number of additions and significant te
A description on how to use and modify libpng libpng version 1.2.5 - October 2, 2002 Updated and distributed by Glenn Randers-Pehrson <glennrp@users.sf.net> Copyright (c) 1998-2002 Glenn Randers-Pehrson For conditions of distribution and use, see copyright notice in png.h. based on: libpng 1.0 beta 6 version 0.96 May 28, 1997 Updated and distributed by Andreas Dilger Copyright (c) 1996, 1997 Andre
libpng is the official PNG reference library. It supports almost all PNG features, is extensible, and has been extensively tested for over 28 years. The home site for development versions (i.e., may be buggy or subject to change or include experimental features) is https://libpng.sourceforge.io/, and the place to go for questions about the library is the png-mng-implement mailing list. libpng is a
If you're using a Windows version of Netscape Navigator and want to print this page (and still be able to read it), click on the png-printable link at the very bottom of this page. Portable Network Graphics An Open, Extensible Image Format with Lossless Compression (Not Related to Papua New Guinea, the Pawnee National Grassland, the Professional Numismatists Guild or the "Pack 'N' Go" format) Welc
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