png

PNG(5) File Formats Manual PNG(5)

NAME

   png - Portable Network Graphics (PNG) format

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.
   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.

SEE ALSO

   libpng(3), zlib(3), deflate(5), and zlib(5)

   PNG Specification (Third Edition) Candidate Recommendation, March 2025:

          https://www.w3.org/TR/2025/CR-png-3-20250313/

   PNG Specification (Second Edition), November 2003:

          https://www.w3.org/TR/2003/REC-PNG-20031110/

   PNG 1.2 Specification, July 1999:

          https://png-mng.sourceforge.io/pub/png/spec/1.2/

   PNG 1.0 Specification, October 1996:

          RFC 2083
          https://www.ietf.org/rfc/rfc2083.txt

          or W3C Recommendation
          https://www.w3.org/TR/REC-png-961001

AUTHORS

   This man page: Glenn Randers-Pehrson, Cosmin Truta

   Portable Network Graphics (PNG) Specification (Second Edition) Information technology - Computer graphics and image processing - Portable Network Graphics (PNG): Functional specifica
   tion.  ISO/IEC 15948:2003 (E) (November 10, 2003): David Duce and others.

   Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999): Glenn Randers-Pehrson and others.

   Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996): Thomas Boutell and others.

                                                                                    April 30, 2025                                                                                  PNG(5)