| .TH PNG 5 "July 1, 2025" |
| .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. |
| .br |
| 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 gamma and chromaticity data for improved color |
| matching on heterogeneous platforms. |
| |
| .SH "SEE ALSO" |
| .BR "libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5) |
| .LP |
| PNG Specification (Third Edition), June 2025: |
| .IP |
| .br |
| https://www.w3.org/TR/2025/REC-png-3-20250624/ |
| .LP |
| PNG Specification (Second Edition), November 2003: |
| .IP |
| .br |
| https://www.w3.org/TR/2003/REC-PNG-20031110/ |
| .LP |
| PNG 1.2 Specification, August 1999: |
| .IP |
| .br |
| https://www.libpng.org/pub/png/spec/1.2/ |
| .LP |
| PNG 1.1 Specification, December 1998: |
| .IP |
| .br |
| https://www.libpng.org/pub/png/spec/1.1/ |
| .LP |
| PNG 1.0 Specification, October 1996: |
| .IP |
| .br |
| RFC 2083 |
| .br |
| https://www.ietf.org/rfc/rfc2083.txt |
| .IP |
| .br |
| or W3C Recommendation |
| .br |
| https://www.w3.org/TR/REC-png-961001 |
| |
| .SH AUTHORS |
| This man page: Glenn Randers-Pehrson, Cosmin Truta |
| .LP |
| Portable Network Graphics (PNG) Specification (Third Edition). |
| W3C Recommendation 24 June 2025: |
| Chris Blume et al. |
| .LP |
| Portable Network Graphics (PNG) Specification (Second Edition) |
| Information technology - Computer graphics and image processing - |
| Portable Network Graphics (PNG): Functional specification. |
| ISO/IEC 15948:2003 (E), W3C Recommendation 10 November 2003: |
| David Duce et al. |
| .LP |
| Portable Network Graphics (PNG) Specification Version 1.2 (11 August 1999): |
| Glenn Randers-Pehrson et al. |
| .LP |
| Portable Network Graphics (PNG) Specification Version 1.1 (31 December 1998): |
| Glenn Randers-Pehrson et al. |
| .LP |
| Portable Network Graphics (PNG) Specification Version 1.0. |
| IETF RFC 2083, W3C Recommendation 1 October 1996: |
| Thomas Boutell et al. |
| |
| .\" end of man page |
