PNG specification

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PNG specification


Dear Friends,


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.


If you would like to read the whole specification, please visit .

It is available and free.



Best Regards,


Sally Catlett                             Astra Design Company

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