diff options
Diffstat (limited to 'src/image/png/testdata/pngsuite/README')
| -rw-r--r-- | src/image/png/testdata/pngsuite/README | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/image/png/testdata/pngsuite/README b/src/image/png/testdata/pngsuite/README new file mode 100644 index 000000000..c0f78bde8 --- /dev/null +++ b/src/image/png/testdata/pngsuite/README @@ -0,0 +1,21 @@ +The *.png and README.original files in this directory are copied from +libpng.org, specifically contrib/pngsuite/* in libpng-1.2.40.tar.gz. +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-two 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 were actually generated by first converting the PNG +to a bitdepth of 8 and then running sng on them. basn4a08.sng was generated +by from a 16-bit rgba version of basn4a08.png rather than the original +gray + alpha. |