What are we stripping? What are we keeping? Could we safely strip more than what we currently are?
Description
Description
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Open | None | T111633 Optimize thumbs right after creation | |||
| Resolved | • Gilles | T114518 Investigate PNG metadata in thumbnails |
Event Timeline
Comment Actions
At the very least, the useless crap from http://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html should be removed (Can be done by changing im arguments)
Comment Actions
From T20871 it seems all structured metadata is stripped and the commons URL is added in a comment. You could save a couple bytes by using MediaWiki-extensions-ShortUrl.
There is also a longstanding request (same task) to strip less, ie. put the author and license in the thumbnail metadata.
Comment Actions
As @Bawolff pointed out, we strip most metadata from PNG thumbnails but not "thumbnail metadata". Which manifests itself as these fields when inspecting a thumbnail with exiftool:
Thumb Document Pages : 1 Thumb Imageheight : 4608 Thumb Image Width : 3072 Thumb Mimetype : image/png Thumb M Time : 1455745807
@Bawolff which IM arguments do you know to be capable of removing these fields?
Comment Actions
We figured out what's filtered and what could be, I think that "going the extra mile", if it's possible, should be a separate task.