| PNG Specification: The official W3C recommendation specification for PNG. |
| Explorer versus PNG (AlphaImageLoader): Information on displaying transparent and translucent (alpha channel) PNGs in Internet Explorer and other browsers. |
| 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. |
| Open Source Graphics with PNG: Joe Barr discusses PNG, the new open source file format, and the Unisys/CompuServe/GIF controversy. [LinuxWorld] |
| PNG: Information, applications, and code relating to the PNG image format. |
| 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. |
| PNG Tips for Cartoonists: Article written to encourage cartoonists to use PNG and to share tips on exploiting PNG's strengths. |
| 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 focused on the compression algorithms used in PNG. |
| Portable Network Graphics - PNG: Thorough introduction to PNG image format. |
| The Sad Story of PNG Gamma Correction: Explains how PNG gamma "correction" causes color mismatches with other colors on web pages. |
| The Story of PNG: An article detailing the history of the PNG format. |
| W3C: PNG: W3C overview of PNG. Includes browser tests to see if gamma and alpha work correctly. |
Classical
