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Failed to generate thumbnails for some PNG files on Wikimedia Commons
Closed, DuplicatePublicBUG REPORT

Description

List of steps to reproduce (step by step, including full links if applicable):

  • Upload some PNG file

What happens?:
Recently, Wikimedia Commons cannot generate thumbnails for some of PNG images that I uploaded.
https://commons.wikimedia.org/w/index.php?title=Special:ListFiles/Meow&ilshowall=1

截圖 2021-07-28 16.53.35.png (800×498 px, 37 KB)

截圖 2021-07-28 16.53.52.png (370×1 px, 39 KB)

What should have happened instead?:
Thumbnails should be generated for the images successfully.

Event Timeline

Meow triaged this task as High priority.Jul 28 2021, 8:54 AM
Meow edited projects, added UploadWizard; removed Thumbor.
Meow updated the task description. (Show Details)
Aklapper raised the priority of this task from High to Needs Triage.Jul 28 2021, 9:01 AM

I just saw it ‘needs triage’.

Can I ask why so many tasks have been moved around columns? You seem to be doing it backwards and forwards and if there's no need it can spam a lot of people.

I just saw it ‘needs triage’.

Can I ask why so many tasks have been moved around columns? You seem to be doing it backwards and forwards and if there's no need it can spam a lot of people.

I didn’t know I can move it by dragging. I thought I could select some while using ‘Move Task to Column...’, but it just moved them all instead. What I did later was recovering all by dragging one by one.

The interface is not easy to use for me and it seems this bug is not important to people.

No problem, we're happy to help you learn if you need in the various forums available. (MediaWiki.org or Libera IRC #wikimedia-tech)

Thumbnail generation works fine example (NSFW), not a Thumbor problem.

Files were uploaded successfully, not an UploadWizard problem.

0x0px PNGs are likely related to T286273: Image size is not determined for new PNG files with (partially) corrupt metadata. identify -verbose and pngfix -e -w both report no errors with the files I tested.

The Ashka drawings had oversize chunks per T286273. That task is blocked waiting for review. The hurricane images similarly have oversize chunks but I was not planning on fixing them since they are old images.