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Use Chroma subsampling for MediaWiki JpegHandler thumbs
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Per T122242.

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Enable 4:2:0 chroma subsampling for JPEG thumbnailsmediawiki/coremaster+170 -2
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Krinkle created this task.Mar 7 2016, 8:10 PM
Restricted Application added projects: Multimedia, Commons. · View Herald TranscriptMar 7 2016, 8:10 PM
Restricted Application added subscribers: Steinsplitter, Aklapper. · View Herald Transcript
• brion mentioned this in T122242: Use Chroma subsampling for image thumbnails (save 17% bandwidth and save memory on mobile).Mar 7 2016, 8:18 PM
• Jrtorres432 renamed this task from Use Chroma subsampling for MediaWiki JpegHandler thumbs to Use Chroma subsampling for MediaWiki jrtorres42.Mar 9 2016, 11:47 PM
• Jrtorres432 removed • brion as the assignee of this task.
• Jrtorres432 removed projects: Commons, Multimedia.
• Jrtorres432 edited subscribers, added: Wikimedia-GitHub; removed: ori, • brion, • Gilles and 3 others.
Restricted Application added a project: Multimedia. · View Herald TranscriptMar 9 2016, 11:47 PM
Krenair renamed this task from Use Chroma subsampling for MediaWiki jrtorres42 to Use Chroma subsampling for MediaWiki JpegHandler thumbs.Mar 9 2016, 11:49 PM
Krenair added a project: Commons.
Krenair edited subscribers, added: ori, • brion, • Gilles and 3 others; removed: Wikimedia-GitHub.
Restricted Application added a subscriber: Matanya. · View Herald TranscriptMar 9 2016, 11:49 PM
• brion claimed this task.Mar 9 2016, 11:49 PM
ori added a comment.Apr 26 2016, 8:54 PM

@brion, is this still on your radar?

Restricted Application added a subscriber: Poyekhali. · View Herald TranscriptApr 26 2016, 8:54 PM
• brion added a comment.Apr 26 2016, 8:56 PM

Yeah lemme poke that later today.

ori awarded a token.Apr 26 2016, 8:57 PM
Jdforrester-WMF added a project: Performance Issue.Apr 26 2016, 9:08 PM
gerritbot subscribed.Apr 27 2016, 4:29 PM

Change 285669 had a related patch set uploaded (by Brion VIBBER):
[WIP] Enable 4:2:0 chroma subsampling for JPEG thumbnails

https://gerrit.wikimedia.org/r/285669

gerritbot added a project: Patch-For-Review.Apr 27 2016, 4:29 PM
• brion added a comment.Apr 27 2016, 5:31 PM

Ok, patch is ready to review, test cases work and everything.

gerritbot added a comment.Apr 28 2016, 12:02 AM

Change 285669 merged by jenkins-bot:
Enable 4:2:0 chroma subsampling for JPEG thumbnails

https://gerrit.wikimedia.org/r/285669

Jdforrester-WMF closed this task as Resolved.Apr 28 2016, 12:51 AM
Jdforrester-WMF removed a project: Patch-For-Review.
ReleaseTaggerBot added projects: MW-1.27-release (WMF-deploy-2016-05-03_(1.27.0-wmf.23)), MW-1.27-release-notes.Apr 28 2016, 1:00 AM
• Gilles added a comment.May 2 2016, 11:19 AM

Has this been announced on Commons village pump or similar?

• brion added a comment.May 2 2016, 11:30 AM

Don't know, but Commons would not be the only place affected; it would affect all our sites. And it won't affect any of our sites until VIPS is also updated, as I understand?

• Gilles added a comment.May 2 2016, 12:17 PM

It will affect all our sites, VIPS is only used for large TIFFs and PNGs in production: https://github.com/wikimedia/operations-mediawiki-config/blob/132b133b6954ee5b2c186ddb088764f9cd3c5d3c/wmf-config/CommonSettings.php#L2470

I just brought up Commons because they have the community that tends to be the most sensitive to these changes.

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