PNG Specification
- The official W3C recommendation specification for PNG.
APNG Specification - An extension of the PNG image format, adding support for animated images. Includes full specification including file structure and version changes.
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, transparency from zero to 100 percent is supported.
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.
W3C: PNG - W3C overview of PNG. Includes browser tests to see if gamma and alpha work correctly.
Open Source Graphics with PNG - Joe Barr discusses PNG, the new open source file format, and the Unisys/CompuServe/GIF controversy. [LinuxWorld] (September 9, 1999)
The Story of PNG - An article detailing the history of the PNG format. (February 29, 1999)
