- W3C: PNG - W3C overview of PNG. Includes browser tests to see if gamma and alpha work correctly.
- PNG - Information, applications, and code relating to the PNG image format.
- PNG Specification - The official W3C recommendation specification for PNG.
- Open Source Graphics with PNG - Joe Barr discusses PNG, the new open source file format, and the Unisys/CompuServe/GIF controversy. [LinuxWorld]
- The Story of PNG - An article detailing the history of the PNG format.
- Explorer versus PNG (AlphaImageLoader) - Information on displaying transparent and translucent (alpha channel) PNGs in Internet Explorer and other browsers.
- PNG-Tech - A collection of comments, impressions, comparisons, experiments and ideas regarding the PNG (Portable Network Graphics) file format, and related technologies: ZLIB (Data Compression Format and Library), and MNG (Multiple-Image Network Graphics). It is foc
- Portable Network Graphics - PNG - Thorough introduction to PNG image format.
- MSDN - AlphaImageLoader Filter - Displays an image within the boundaries of the object and between the object background and content, with options to clip or resize the image. When loading a Portable Network Graphics (PNG) image, tranparency—from zero to 100 percent—is supported.
- PNG Tips for Cartoonists - Article written to encourage cartoonists to use PNG and to share tips on exploiting PNG's strengths.
- PNG Resources of the Miscellaneous Persuasion - Links to images, mailing lists, test images, PNG and image compression documents, comics and websites using PNGs, the official site, and some unofficial resource sites.
- The Sad Story of PNG Gamma Correction - Explains how PNG gamma "correction" causes color mismatches with other colors on web pages.
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