Portable Network Graphics (PNG) Specification and Extensions The original specification for PNG, version 1.0, was written by Thomas Boutell and Tom Lane, with contributions by many others. On 1 October 1996 it was released by the W3C as its first Recommendation, and on 15 January 1997 it was released by the IETF as RFC 2083. Version 1.1 of the spec included a number of additions and significant te