PNG 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 for transparency. Sample depths range from 1 to 16 bits.

Extrait de [ recommandation Portable Network Graphics Specification (Second Edition). Information technology — Computer graphics and image processing — Portable Network Graphics (PNG): Functional specification. ISO/IEC 15948:2003 (E)]

Recommandations (attention, cette partie est maintenue de façon occasionnelle)
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Portable Network Graphics Specification (Second Edition). Information technology — Computer graphics and image processing — Portable Network Graphics (PNG): Functional specification. ISO/IEC 15948:2003 (E)
- Recommandation, 10-11-2003, version ISO/IEC 15948:2003
- accès à l'historique des versions
Objectifs

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Haut Portails et sites collecteurs
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Portable Network Graphics (PNG) Home Page (W3C)
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Portable Network Graphics Home Page (libpng)
Haut FAQ
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PNG Frequently Asked Questions (Greg Roelofs)

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