Hi,
if I use tiffcp with p=2, zstd and stripes, the compression ratio is 52,6%. PNG goes to 52,7%. Mode webp is not useable, because not applicable for 2/3 of my testset. With best regards Andreas -- 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 Von: Olivier Paquet <[email protected]> Gesendet: Freitag, 28. November 2025 18:26 An: Romeyke, Andreas <[email protected]> Cc: [email protected] Betreff: Re: [Tiff] Overview of supported/registered compression mode? Anybody working on FFV1 or QOI support? Le ven. 28 nov. 2025, à 09 h 32, Bob Friesenhahn via Tiff <[email protected] <mailto:[email protected]> > a écrit : The performance of compression in libtiff is rather dependent on strip/tile sizes. Have you investigated modifying strip/tile sizes to see if more can be gained from existing codecs? And this is especially true of zstd which supports a huge dictionary. It also has multiple compression levels and the default is quite far from the maximum. Make sure the correct predictor is set as well. It should have no trouble getting smaller files than png in my experience. Olivier
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