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	W3C: PNG - http://www.w3.org/Graphics/PNG/ W3C overview of PNG. Includes browser tests to see if gamma and alpha work correctly.
	http://www.libpng.org/pub/png/ - http://www.libpng.org/pub/png/ Information, applications, and code relating to the PNG image format.
	PNG Specification - http://www.w3.org/TR/REC-png-multi.html The official W3C recommendation specification for PNG.
	The Story of PNG - http://www.libpng.org/pub/png/slashpng-1999.html An article detailing the history of the PNG format.
	PNG Resources of the Miscellaneous Persuasion - http://www.libpng.org/pub/png/pngmisc.html 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.

	PngCrush - http://pmt.sourceforge.net/ Includes various free tools to create and manipulate PNG and MNG images, including an optimizer that can reduce the size of PNG images and a converter that can import BMP files.
	PNG-Tech - http://optipng.sourceforge.net/pngtech/ 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.
	The Sad Story of PNG Gamma Correction - http://hsivonen.iki.fi/png-gamma/ Explains how PNG gamma "correction" causes color mismatches with other colors on web pages.
	PNG Tips for Cartoonists - http://hackles.org/etc/png.html Article written to encourage cartoonists to use PNG and to share tips on exploiting PNG's strengths.
	Portable Network Graphics - PNG - http://www.mywebsite.force9.co.uk/png/ Thorough introduction to PNG image format.

	APNG Edit - https://addons.mozilla.org/firefox/addon/5519 A firefox extension to allow the creation and editing of APNG files.
	MSDN - AlphaImageLoader Filter - http://msdn.microsoft.com/en-us/library/ms532969.aspx 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.
	APNG Specification - http://wiki.mozilla.org/APNG_Specification An extension of the PNG image format, adding support for animated images. Includes full specification including file structure and version changes.
	Open Source Graphics with PNG - http://www.linuxtoday.com/news_story.php3?ltsn=1999-09-09-021-04-PS Joe Barr discusses PNG, the new open source file format, and the Unisys/CompuServe/GIF controversy. [LinuxWorld]

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