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Diffstat (limited to 'src/image/png/testdata/pngsuite/README')
| -rw-r--r-- | src/image/png/testdata/pngsuite/README | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/image/png/testdata/pngsuite/README b/src/image/png/testdata/pngsuite/README new file mode 100644 index 0000000..01d1d89 --- /dev/null +++ b/src/image/png/testdata/pngsuite/README @@ -0,0 +1,20 @@ +The *.png and README.original files in this directory are copied from +libpng.org, specifically contrib/pngsuite/* in libpng 1.6.26. + +README.original gives the following license for those files: + + Permission to use, copy, and distribute these images for any purpose + and without fee is hereby granted. + +The files basn0g01-30.png, basn0g02-29.png and basn0g04-31.png are in fact not +part of pngsuite but were created from files in pngsuite. Their non-power-of-2 +sizes makes them useful for testing bit-depths smaller than a byte. + +basn3a08.png was generated from basn6a08.png using the pngnq tool, which +converted it to the 8-bit paletted image with alpha values in tRNS chunk. + +The *.sng files in this directory were generated from the *.png files by the +sng command-line tool and some hand editing. The files basn0g0{1,2,4}.sng and +ftbbn0g0{1,2,4}.sng were actually generated by first converting the PNG to a +bitdepth of 8 and then running sng on them. basn4a08.sng was generated from a +16-bit rgba version of basn4a08.png rather than the original gray + alpha. |