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Based on the PNGsuite. (text copied from the official PNGsuite homepage) PNG uses file-filtering, for optimal compression. Normally the type of filtering is adjusted to the contents of the picture, but here each file has the same picture, with a different filtering.
The leftmost block of images (2x5) is the reference snapshot. The rightmost block should look identical. If it doesn't, your software does not handle the filter-mechanism correctly.

PNGFxxxx.mng
The following images were used (left to right): (first row) f00n2c08 - color, no interlacing, filter-type 0 f01n2c08 - color, no interlacing, filter-type 1 f02n2c08 - color, no interlacing, filter-type 2
f03n2c08 - color, no interlacing, filter-type 3
f04n2c08 - color, no interlacing, filter-type 4
(second row)
f00n0g08 - grayscale, no interlacing, filter-type 0
f01n0g08 - grayscale, no interlacing, filter-type 1
f02n0g08 - grayscale, no interlacing, filter-type 2
f03n0g08 - grayscale, no interlacing, filter-type 3
f04n0g08 - grayscale, no interlacing, filter-type 4

Samples on this page are Copyright © G. Juyn Images used in the samples are Copyright © Willem van Schaik

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