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.TH PNG 5 "April 14, 2019"
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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), " libpngpf"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
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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, July 1999:
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.IP
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.br
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https://png-mng.sourceforge.io/pub/png/spec/1.2/
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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: Cosmin Truta, Glenn Randers-Pehrson
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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) (November 10, 2003): David Duce and others.
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.LP
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Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
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Glenn Randers-Pehrson and others (png-list).
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.LP
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Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
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Thomas Boutell and others (png-list).
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.SH COPYRIGHT
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.LP
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This man page is
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.br
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Copyright (c) 2018-2019 Cosmin Truta.
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.br
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Copyright (c) 1998-2006 Glenn Randers-Pehrson.
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.br
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See png.h for conditions of use and distribution.
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.LP
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The PNG Specification (Second Edition) is
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.br
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Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.
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.LP
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The PNG-1.2 Specification is
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.br
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Copyright (c) 1999 Glenn Randers-Pehrson.
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.br
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See the specification for conditions of use and distribution.
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.LP
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The PNG-1.0 Specification is
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.br
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Copyright (c) 1996 Massachusetts Institute of Technology.
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.br
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See the specification for conditions of use and distribution.
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.\" end of man page
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