[Bug 66337] Scaling of images should take place in a linear colour space
https://bugzilla.wikimedia.org/show_bug.cgi?id=66337 John Cupitt jcup...@gmail.com changed: What|Removed |Added CC||jcup...@gmail.com --- Comment #2 from John Cupitt jcup...@gmail.com --- Some benchmarks: $ time vipsthumbnail -a wtc.jpg --vips-leak memory: high-water mark 65.98 MB real0m4.039s user0m4.003s sys0m0.038s $ time vipsthumbnail wtc.jpg --vips-leak memory: high-water mark 6.22 MB real0m0.307s user0m0.289s sys0m0.020s wtc.jpg is a 10,000 x 10,000 pixel RGB image. The main source of the slowdown is that you can't use libjpeg's very fast shrink-on-load feature, since that's calculated in Y, which is not linear. Instead, you have to decode the entire image, convert to a linear space (vipsthumbnail uses XYZ), and then shrink that. -a is much more competitive if you use a format that doesn't support shrink-on-load, such as vanilla tif: $ time vipsthumbnail wtc.tif --vips-leak memory: high-water mark 44.31 MB real0m2.662s user0m0.513s sys0m0.119s $ time vipsthumbnail -a wtc.tif --vips-leak memory: high-water mark 66.62 MB real0m3.623s user0m3.547s sys0m0.078s memuse should not be huge, the whole process can still be streamed. -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ Wikibugs-l mailing list Wikibugs-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikibugs-l
[Bug 66337] Scaling of images should take place in a linear colour space
https://bugzilla.wikimedia.org/show_bug.cgi?id=66337 Andre Klapper aklap...@wikimedia.org changed: What|Removed |Added Priority|Unprioritized |Normal Version|unspecified |1.24-git -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ Wikibugs-l mailing list Wikibugs-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikibugs-l
[Bug 66337] Scaling of images should take place in a linear colour space
https://bugzilla.wikimedia.org/show_bug.cgi?id=66337 Bawolff (Brian Wolff) bawolff...@gmail.com changed: What|Removed |Added Priority|Normal |Low -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ Wikibugs-l mailing list Wikibugs-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikibugs-l
[Bug 66337] Scaling of images should take place in a linear colour space
https://bugzilla.wikimedia.org/show_bug.cgi?id=66337 --- Comment #1 from Bawolff (Brian Wolff) bawolff...@gmail.com --- Its unclear if something similar can be done in vips well still using the very efficient sequential read and not creating a giant temporary file. There is a -a option to vipsthumbnail that could maybe be used. In my test, the -a option slowed things down quite a bit, and increased memory usage to beyond 400mb. :( -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ Wikibugs-l mailing list Wikibugs-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikibugs-l
