Related articles about PNG and MNG compression
Here is an index of sites that host uncompressed, PNG-compressed, or
otherwise-losslessly-compressed images which can be freely distributed, and can
be used in compression tests.
The Waterloo Image Repository ("BragZone")
The Waterloo Repertoire is a suite of 32 images (12 small grayscale,
12 medium grayscale, and 8 large full color), which includes the famous
Kodak PhotoCD PCD0992
PCD0992 was a set of 24 images in PhotoCD (N.B. not PictureCD) format,
released by Kodak and put into public domain. The BASE resolution (768x512) was
extracted and converted to RGB format. This set of RGB images eventually became
a reference. Originally hosted by the Rensellaer Polytechnic Institute, the set
is now available courtesy of Rich Franzen.
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