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.TH PNG 5 "March 7, 1998"
png \- Portable Network Graphics (PNG) format
PNG (Portable Network Graphics) is an extensible file format for the
lossless, portable, well-compressed storage of raster images. PNG provides
a patent-free replacement for GIF and can also replace many
common uses of TIFF. Indexed-color, grayscale, and truecolor images are
supported, plus an optional alpha channel. Sample depths range from
1 to 16 bits.
PNG is designed to work well in online viewing applications, such as the
World Wide Web, so it is fully streamable with a progressive display
option. PNG is robust, providing both full file integrity checking and
fast, simple detection of common transmission errors. Also, PNG can store
gamma and chromaticity data for improved color matching on heterogeneous
.IR libpng(3), zlib(3), deflate(5), and zlib(5)
PNG specification:
RFC 2083
or (as a W3C Recommendation) at
This man page: Glenn Randers-Pehrson
Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
Thomas Boutell and others (
The PNG specification is copyright (c) 1996 Massachussets Institute of
Technology. See the specification for conditions of use and distribution.
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