82 lines
2.2 KiB
Groff
82 lines
2.2 KiB
Groff
.TH PNG 5 "January 12, 2026"
|
|
.SH NAME
|
|
png \- Portable Network Graphics (PNG) format
|
|
|
|
.SH DESCRIPTION
|
|
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.
|
|
.P
|
|
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 color space data for improved color matching on
|
|
heterogeneous platforms.
|
|
|
|
.SH "SEE ALSO"
|
|
.BR "libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
|
|
.LP
|
|
Portable Network Graphics (PNG) Specification (Third Edition):
|
|
.IP
|
|
.br
|
|
W3C Recommendation 24 June 2025
|
|
.br
|
|
https://www.w3.org/TR/2025/REC-png-3-20250624/
|
|
.LP
|
|
Portable Network Graphics (PNG) Specification (Second Edition):
|
|
.IP
|
|
.br
|
|
ISO/IEC 15948:2004(E)
|
|
.br
|
|
https://www.iso.org/standard/29581.html
|
|
.IP
|
|
.br
|
|
W3C Recommendation 10 November 2003
|
|
.br
|
|
https://www.w3.org/TR/2003/REC-PNG-20031110/
|
|
.LP
|
|
Portable Network Graphics (PNG) Specification Version 1.2:
|
|
.IP
|
|
.br
|
|
Published by the PNG Development Group on 14 July 1999
|
|
.br
|
|
https://www.libpng.org/pub/png/spec/1.2/
|
|
.LP
|
|
Portable Network Graphics (PNG) Specification Version 1.1:
|
|
.IP
|
|
.br
|
|
Published by the PNG Development Group on 15 February 1999
|
|
.br
|
|
https://www.libpng.org/pub/png/spec/1.1/
|
|
.LP
|
|
Portable Network Graphics (PNG) Specification Version 1.0:
|
|
.IP
|
|
.br
|
|
IETF RFC 2083, March 1997
|
|
.br
|
|
https://www.ietf.org/rfc/rfc2083.txt
|
|
.IP
|
|
.br
|
|
W3C Recommendation 1 October 1996
|
|
.br
|
|
https://www.w3.org/TR/REC-png-961001
|
|
|
|
.SH AUTHORS
|
|
This man page: Glenn Randers-Pehrson, Cosmin Truta, Chris Lilley.
|
|
.LP
|
|
PNG Specification (Third Edition): Chris Blume et al.
|
|
.LP
|
|
PNG Specification (Second Edition): David Duce et al.
|
|
.LP
|
|
PNG Specification Version 1.2: Glenn Randers-Pehrson et al.
|
|
.LP
|
|
PNG Specification Version 1.1: Glenn Randers-Pehrson et al.
|
|
.LP
|
|
PNG Specification Version 1.0: Thomas Boutell et al.
|
|
|
|
.\" end of man page
|