| .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 |
