Thumbnails lessons from oc10

[refs]

Previous pain or ideas around this topic…

original comment on this issue by @michaelstingl

• Aspect ratio / scale options Thumbnail generation: does not obey aspect ratio / max values for x and y core#16250 , Preview API: different aspect ratio / scale options core#31268
• Etag for previews Etag for previews / thumbnails core#35029
• Share thumbnails? Previews-thumbnails get out-of-sync when edited by sharer and sharee core#31855
• Run async / in background Migrate preview generation to async job execution core#11685
• Discussion around supported file/MIME types A mime type can be linked to many file formats core#13647 , Preview API: expose supported file/MIME types via Capabilities endpoint core#31267 , Preview API: provide hint for which files (not) to request a thumbnail #7405
• Multiple thumbnails services for different file types Migrate preview system to external preview server systems core#24424, Video preview (transcoded mp4) in the thumbnails folder core#24480
• Properly EXIF orientation parameters [Extension] thumbnails #10 (comment)
• Extract thumbnails embedded in EXIF Use exif thumbnail for image preview core#7232
• Support for modern media formats like HEIC (High Efficiency Image Coding) and HEVC (High Efficiency Video Coding), Add support heic core#30093, Feature request: HEIC support gallery#737, [iOS11] 3.6.2 can‘t display *.HEIC images ios-legacy#933

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 10 days if no further activity occurs. Thank you for your contributions.

[michaelstingl]

New lesson learned:
We need to preserve embedded color profiles in preview images.

Related:
https://chromachecker.com/info/en/page/webbrowser