Today I found a very
interesting document – Portable Network Graphics Specification, Version
1.2. This document is the official revision on PNG Specification, version 1.0
and defines the
Internet Media Type "image/png".
The PNG specification is on a
standards track under the purview of ISO/IEC JTC 1 SC 24/ It is supposed to be
released eventually as ISO/IEC International Standard 15948. The paper
describes PNG (Portable Network Graphics) format which 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.