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 (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 specification.  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.


                               February 23, 2024                        PNG(5)