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Part III: Graphics > PNG Format

Chapter 16. PNG Format

The Portable Network Format (PNG for short—pronounced "ping") is a versatile and full-featured graphics file format poised to make a big wave on the Web . . . it's just taking its time doing so.

PNG was developed in January and February 1995 as an effort to find a non-proprietary alternative to GIF when Unisys threatened to enforce its patent on LZW compression and collect licensing fees from developers of GIF-supporting programs. This caused a flurry of outrage and activity on the Internet.


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