png.4(4) File Formats png.4(4)NAMEpng - Portable Network Graphics (PNG) format
DESCRIPTION
PNG (Portable Network Graphics) is an extensible file format for the
lossless, portable, well-compressed storage of raster images. PNG pro‐
vides a patent-free replacement for GIF and can also replace many com‐
mon uses of TIFF. Indexed-color, grayscale, and truecolor images are
supported, and 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, and is fully streamable with a progressive display
option. PNG is robust, and provides both full file integrity checking,
and fast simple detection of common transmission errors. PNG can store
gamma and chromaticity data for improved color matching on heteroge‐
neous platforms.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │image/library/libpng │
├─────────────────────────────┼─────────────────────────────┤
│Interface stability │Volatile │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOlibpng(3), zlib(3)
PNG 1.2 specification, July 1999: http://www.libpng.org/pub/png or
ftp://ftp.uu.net/graphics/png/documents
PNG 1.0 specification, October 1996: RFC 2083 ftp://ds.inter‐
nic.net/rfc/rfc2083.txt or as a W3C Recommendation at
http://www.w3.org/TR/REC-png.html
NOTES
This man page was originally written by Glenn Randers-Pehrson. Updated
by Breda McColgan, Sun Microsystems Inc., 2004.
SunOS 5.11 26 Mar 2004 png.4(4)