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basn0g01-30.png06-Dec-2016162
basn0g01-30.sng06-Dec-20161.9K
basn0g01.png06-Dec-2016164
basn0g01.sng06-Dec-20162.2K
basn0g02-29.png06-Dec-2016110
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basn0g02.png06-Dec-2016104
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basn0g04-31.png06-Dec-2016153
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basn0g08.png06-Dec-2016138
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basn2c08.png06-Dec-2016145
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basn3p01.png06-Dec-2016112
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basn3p02.png06-Dec-2016146
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basn4a08.png06-Dec-2016126
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README06-Dec-20161K
README.original06-Dec-20162.7K

README

      1 The *.png and README.original files in this directory are copied from
      2 libpng.org, specifically contrib/pngsuite/* in libpng-1.2.40.tar.gz.
      3 README.original gives the following license for those files:
      4 
      5 	Permission to use, copy, and distribute these images for any purpose
      6 	and without fee is hereby granted.
      7 
      8 
      9 The files basn0g01-30.png, basn0g02-29.png and basn0g04-31.png are in fact
     10 not part of pngsuite but were created from files in pngsuite. Their non-power-
     11 of-two sizes makes them useful for testing bit-depths smaller than a byte.
     12 
     13 basn3a08.png was generated from basn6a08.png using the pngnq tool, which
     14 converted it to the 8-bit paletted image with alpha values in tRNS chunk.
     15 
     16 The *.sng files in this directory were generated from the *.png files
     17 by the sng command-line tool and some hand editing. The files
     18 basn0g0{1,2,4}.sng were actually generated by first converting the PNG
     19 to a bitdepth of 8 and then running sng on them. basn4a08.sng was generated
     20 by from a 16-bit rgba version of basn4a08.png rather than the original
     21 gray + alpha.
     22

README.original

      1 
      2 pngsuite
      3 --------
      4 (c) Willem van Schaik, 1999
      5 
      6 Permission to use, copy, and distribute these images for any purpose and
      7 without fee is hereby granted.
      8 
      9 These 15 images are part of the much larger PngSuite test-set of 
     10 images, available for developers of PNG supporting software. The 
     11 complete set, available at http:/www.schaik.com/pngsuite/, contains 
     12 a variety of images to test interlacing, gamma settings, ancillary
     13 chunks, etc.
     14 
     15 The images in this directory represent the basic PNG color-types:
     16 grayscale (1-16 bit deep), full color (8 or 16 bit), paletted
     17 (1-8 bit) and grayscale or color images with alpha channel. You
     18 can use them to test the proper functioning of PNG software.
     19 
     20     filename      depth type
     21     ------------ ------ --------------
     22     basn0g01.png  1-bit grayscale
     23     basn0g02.png  2-bit grayscale
     24     basn0g04.png  4-bit grayscale
     25     basn0g08.png  8-bit grayscale
     26     basn0g16.png 16-bit grayscale
     27     basn2c08.png  8-bit truecolor
     28     basn2c16.png 16-bit truecolor
     29     basn3p01.png  1-bit paletted
     30     basn3p02.png  2-bit paletted
     31     basn3p04.png  4-bit paletted
     32     basn3p08.png  8-bit paletted
     33     basn4a08.png  8-bit gray with alpha
     34     basn4a16.png 16-bit gray with alpha
     35     basn6a08.png  8-bit RGBA
     36     basn6a16.png 16-bit RGBA
     37 
     38 Here is the correct result of typing "pngtest -m *.png" in
     39 this directory:
     40 
     41 Testing basn0g01.png: PASS (524 zero samples)
     42  Filter 0 was used 32 times
     43 Testing basn0g02.png: PASS (448 zero samples)
     44  Filter 0 was used 32 times
     45 Testing basn0g04.png: PASS (520 zero samples)
     46  Filter 0 was used 32 times
     47 Testing basn0g08.png: PASS (3 zero samples)
     48  Filter 1 was used 9 times
     49  Filter 4 was used 23 times
     50 Testing basn0g16.png: PASS (1 zero samples)
     51  Filter 1 was used 1 times
     52  Filter 2 was used 31 times
     53 Testing basn2c08.png: PASS (6 zero samples)
     54  Filter 1 was used 5 times
     55  Filter 4 was used 27 times
     56 Testing basn2c16.png: PASS (592 zero samples)
     57  Filter 1 was used 1 times
     58  Filter 4 was used 31 times
     59 Testing basn3p01.png: PASS (512 zero samples)
     60  Filter 0 was used 32 times
     61 Testing basn3p02.png: PASS (448 zero samples)
     62  Filter 0 was used 32 times
     63 Testing basn3p04.png: PASS (544 zero samples)
     64  Filter 0 was used 32 times
     65 Testing basn3p08.png: PASS (4 zero samples)
     66  Filter 0 was used 32 times
     67 Testing basn4a08.png: PASS (32 zero samples)
     68  Filter 1 was used 1 times
     69  Filter 4 was used 31 times
     70 Testing basn4a16.png: PASS (64 zero samples)
     71  Filter 0 was used 1 times
     72  Filter 1 was used 2 times
     73  Filter 2 was used 1 times
     74  Filter 4 was used 28 times
     75 Testing basn6a08.png: PASS (160 zero samples)
     76  Filter 1 was used 1 times
     77  Filter 4 was used 31 times
     78 Testing basn6a16.png: PASS (1072 zero samples)
     79  Filter 1 was used 4 times
     80  Filter 4 was used 28 times
     81 libpng passes test
     82 
     83 Willem van Schaik
     84 <willem (a] schaik.com>
     85 October 1999
     86