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pngsuite
--------
(c) Willem van Schaik, 1999

Permission to use, copy, and distribute these images for any purpose and
without fee is hereby granted.

These 15 images are part of the much larger PngSuite test-set of 
images, available for developers of PNG supporting software. The 
complete set, available at http:/www.schaik.com/pngsuite/, contains 
a variety of images to test interlacing, gamma settings, ancillary
chunks, etc.

The images in this directory represent the basic PNG color-types:
grayscale (1-16 bit deep), full color (8 or 16 bit), paletted
(1-8 bit) and grayscale or color images with alpha channel. You
can use them to test the proper functioning of PNG software.

    filename      depth type
    ------------ ------ --------------
    basn0g01.png  1-bit grayscale
    basn0g02.png  2-bit grayscale
    basn0g04.png  4-bit grayscale
    basn0g08.png  8-bit grayscale
    basn0g16.png 16-bit grayscale
    basn2c08.png  8-bit truecolor
    basn2c16.png 16-bit truecolor
    basn3p01.png  1-bit paletted
    basn3p02.png  2-bit paletted
    basn3p04.png  4-bit paletted
    basn3p08.png  8-bit paletted
    basn4a08.png  8-bit gray with alpha
    basn4a16.png 16-bit gray with alpha
    basn6a08.png  8-bit RGBA
    basn6a16.png 16-bit RGBA

Here is the correct result of typing "pngtest -m *.png" in
this directory:

Testing basn0g01.png: PASS (524 zero samples)
 Filter 0 was used 32 times
Testing basn0g02.png: PASS (448 zero samples)
 Filter 0 was used 32 times
Testing basn0g04.png: PASS (520 zero samples)
 Filter 0 was used 32 times
Testing basn0g08.png: PASS (3 zero samples)
 Filter 1 was used 9 times
 Filter 4 was used 23 times
Testing basn0g16.png: PASS (1 zero samples)
 Filter 1 was used 1 times
 Filter 2 was used 31 times
Testing basn2c08.png: PASS (6 zero samples)
 Filter 1 was used 5 times
 Filter 4 was used 27 times
Testing basn2c16.png: PASS (592 zero samples)
 Filter 1 was used 1 times
 Filter 4 was used 31 times
Testing basn3p01.png: PASS (512 zero samples)
 Filter 0 was used 32 times
Testing basn3p02.png: PASS (448 zero samples)
 Filter 0 was used 32 times
Testing basn3p04.png: PASS (544 zero samples)
 Filter 0 was used 32 times
Testing basn3p08.png: PASS (4 zero samples)
 Filter 0 was used 32 times
Testing basn4a08.png: PASS (32 zero samples)
 Filter 1 was used 1 times
 Filter 4 was used 31 times
Testing basn4a16.png: PASS (64 zero samples)
 Filter 0 was used 1 times
 Filter 1 was used 2 times
 Filter 2 was used 1 times
 Filter 4 was used 28 times
Testing basn6a08.png: PASS (160 zero samples)
 Filter 1 was used 1 times
 Filter 4 was used 31 times
Testing basn6a16.png: PASS (1072 zero samples)
 Filter 1 was used 4 times
 Filter 4 was used 28 times
libpng passes test

Willem van Schaik
<[e-mail]>
October 1999