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New version of image is not displayed.
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Description

When I change an lower quality image into a higher quality image, I hoped the original image would uploaded as it is, but the uploaded image showing lower quality of the previous lower quality image. The image has been just bigger with low quality. When I upload the same HQ image in another name, the quality of image is similar with the original image. When I move the first uploaded file into another name, the quality of image had got back into original quality. But moving it to the original title, the quality degraded again, not the quality remains. I also tried purge, but the image doesn't renewed.

The problem occurs 'libertygame' wiki(A=File:낚시질.jpg; B=File:낚시질2.jpg; C=File:낚시질1.jpg) and public test wiki(A=File:file test fishing.jpg), but test.wikipedia.org(A=File:file test fishing.jpg) doesn't. So it seems to be miraheze's problem.

Reproduce:

  1. Prepare a small thumbnail image and its original image. (I'm not sure it can be reproduced with totally different images, but it worth to try.)
  1. Upload the lower quality image. (You're free to name it. I'll call the file's title A.)
  2. Change the file A into the higher quality image.
  3. Compare the new file A with original higher quality image you have.
    • You'll find that the file A's quality is different with your original file.
  1. Upload the same higher quality image in another title. (I'll call the file's title B.)
  2. Compare the file B with original file and file A.
    • You'll find that the file B is same with original file you have.
    • You'll find that the file B has higher quality than file A.
  1. Move file A into the different title. (I'll call the new title C.)
  2. Compare the file C with file A and original file.
    • You'll find that the file C have got higher quality than before.
    • You'll find that the file C looks same with the original file or file B.
  1. Move file C into A again.
  2. Compare the file A with the privious A, file C and original file.
    • You'll find that file A have got back into the lower quality of the previous A.
    • You'll find that file A looks worse than file C or the original file.

Tested Images:

original file

low quality file

file A

Event Timeline

hsl0 created this task.Sun, Sep 13, 19:26
hsl0 updated the task description. (Show Details)Sun, Sep 13, 19:31
Universal_Omega triaged this task as Normal priority.Sun, Sep 13, 19:36
Universal_Omega moved this task from Backlog to Bugs on the MediaWiki board.
hsl0 renamed this task from The new version of image is not displayed. to New version of image is not displayed..Sun, Sep 13, 20:01
Zppix added a subscriber: Zppix.Mon, Sep 14, 14:40

Can you provide a link to an example of the issue?

Zppix moved this task from Bugs to Pending answer on the MediaWiki board.Mon, Sep 14, 17:08
hsl0 added a comment.EditedMon, Sep 14, 18:30
In T6175#120802, @Zppix wrote:

Can you provide a link to an example of the issue?

'libertygame' wiki (libertygame.miraheze.org):
A: https://libertygame.miraheze.org/wiki/File:낚시질.jpg
B: https://libertygame.miraheze.org/wiki/File:낚시질2.jpg
C: https://libertygame.miraheze.org/w/index.php?title=File:낚시질1.jpg&redirect=no (already moved to A, redirect to A now)

public test wiki (publictestwiki.com):
A: https://publictestwiki.com/wiki/File:File_test_fishing.jpg (removed by administrator)

test.wikipedia.org (problem not occurs):
A: https://test.wikipedia.org/wiki/File:File_test_fishing.jpg

Zppix added a comment.Sat, Sep 19, 18:24

Can you try to reproduce on TestWiki?

Dmehus added a subscriber: Dmehus.Sun, Sep 20, 03:23

Are you sure this is not standard caching?

hsl0 added a comment.Wed, Sep 23, 15:17

Are you sure this is not standard caching?

I'm not sure, but it should be fixed whether in Miraheze or Mediawiki. If it's standard caching, I think Mediawiki should provide force image cache purging feature at least. (action=purge didn't worked for image) The problem didn't reproduced in wikipedia test site, so I posted the issue here.

hsl0 added a comment.EditedWed, Sep 23, 15:19
In T6175#121220, @Zppix wrote:

Can you try to reproduce on TestWiki?

https://publictestwiki.com/wiki/File:Reproduce_fishing.jpg

I tried steps until 3~4 and purging in action=purge. If you want to see further steps, I'll do that when you request.

Zppix added a comment.Wed, Sep 23, 15:54

I honestly don't see any issues with the file

hsl0 claimed this task.Wed, Sep 23, 16:32
This comment was removed by hsl0.
hsl0 added a comment.Wed, Sep 23, 16:32
In T6175#121513, @Zppix wrote:

I honestly don't see any issues with the file

Compare with https://publictestwiki.com/wiki/File:Reproduce_fishing_B.jpg

hsl0 removed hsl0 as the assignee of this task.Wed, Sep 23, 16:33