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79 lines
2.3 KiB
Groff
79 lines
2.3 KiB
Groff
.TH PNG 5 "July 1, 2025"
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.SH NAME
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png \- Portable Network Graphics (PNG) format
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.SH DESCRIPTION
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PNG (Portable Network Graphics) is an extensible file format for the
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lossless, portable, well-compressed storage of raster images. PNG
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provides a patent-free replacement for GIF, and can also replace many
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common uses of TIFF. Indexed-color, grayscale, and truecolor images are
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supported, plus an optional alpha channel. Sample depths range from
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1 to 16 bits.
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.br
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PNG is designed to work well in online viewing applications, such
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as the World Wide Web, so it is fully streamable with a progressive
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display option. PNG is robust, providing both full file integrity
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checking and fast, simple detection of common transmission errors.
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Also, PNG can store gamma and chromaticity data for improved color
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matching on heterogeneous platforms.
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.SH "SEE ALSO"
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.BR "libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
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.LP
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PNG Specification (Third Edition), June 2025:
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.IP
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.br
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https://www.w3.org/TR/2025/REC-png-3-20250624/
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.LP
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PNG Specification (Second Edition), November 2003:
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.IP
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.br
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https://www.w3.org/TR/2003/REC-PNG-20031110/
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.LP
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PNG 1.2 Specification, August 1999:
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.IP
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.br
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https://www.libpng.org/pub/png/spec/1.2/
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.LP
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PNG 1.1 Specification, December 1998:
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.IP
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.br
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https://www.libpng.org/pub/png/spec/1.1/
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.LP
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PNG 1.0 Specification, October 1996:
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.IP
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.br
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RFC 2083
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.br
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https://www.ietf.org/rfc/rfc2083.txt
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.IP
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.br
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or W3C Recommendation
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.br
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https://www.w3.org/TR/REC-png-961001
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.SH AUTHORS
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This man page: Glenn Randers-Pehrson, Cosmin Truta
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.LP
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Portable Network Graphics (PNG) Specification (Third Edition).
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W3C Recommendation 24 June 2025:
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Chris Blume et al.
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.LP
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Portable Network Graphics (PNG) Specification (Second Edition)
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Information technology - Computer graphics and image processing -
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Portable Network Graphics (PNG): Functional specification.
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ISO/IEC 15948:2003 (E), W3C Recommendation 10 November 2003:
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David Duce et al.
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.LP
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Portable Network Graphics (PNG) Specification Version 1.2 (11 August 1999):
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Glenn Randers-Pehrson et al.
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.LP
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Portable Network Graphics (PNG) Specification Version 1.1 (31 December 1998):
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Glenn Randers-Pehrson et al.
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.LP
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Portable Network Graphics (PNG) Specification Version 1.0.
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IETF RFC 2083, W3C Recommendation 1 October 1996:
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Thomas Boutell et al.
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.\" end of man page
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