Hi,
For our long-term archive, we are considering switching from baseline TIFF 6.0 to a successor format that can efficiently compress images losslessly. To minimize conversion issues, one option would be to simply change the codec within TIFF. We've seen that "tiffcp" supports lzw, lzma, and zstd. Compared to the lossless encoding in Quite OK Image File Format (qoi), PNG, and especially compared to FFV1 or JPEG XL, the achievable compression rates are suboptimal[1]. Therefore, our question is: Is there an overview of which codecs libtiff currently supports? And is anyone already working on integrating qio or FFV1? If not, would such extensions have a chance of being incorporated into libtiff? With best regards Andreas [1] our testset (scans historic monographs) results in ff. lossless compression ratios: tiff/lzw - 94% tiff/zstd - 67% qoi - 50% png - 53% ffv1 - 36% jpeg-xl - 33% -- team member "long-term preservation" Saxon State- and University Library Dresden (SLUB) Department 2 (IT), Division 2.3 (infrastructure and digital long-term preservation) Zellescher Weg 18 | 01069 Dresden phone: +49 351 4677 763 E-Mail: <mailto:[email protected]> [email protected] <http://www.slub-dresden.de/> http://www.slub-dresden.de/ | @slubdresden
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