Last modified: 2011-07-15 03:48:57 UTC

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Bug 15488 - Image thumbnail generator adding large amounts of artefacts
Image thumbnail generator adding large amounts of artefacts
Status: RESOLVED WONTFIX
Product: MediaWiki
Classification: Unclassified
File management (Other open bugs)
unspecified
All All
: Low major (vote)
: ---
Assigned To: Nobody - You can work on this!
:
Depends on:
Blocks:
  Show dependency tree / graph
 
Reported: 2008-09-05 15:38 UTC by Adam Cuerden
Modified: 2011-07-15 03:48 UTC (History)
4 users (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---

Attachments
Resized with default options (83.45 KB, image/jpeg)
2009-02-24 12:59 UTC, Tim Starling 		Details
Resized with sharpening (94.69 KB, image/jpeg)
2009-02-24 13:01 UTC, Tim Starling 		Details
Resized with sharpening and reduced quality (51.18 KB, image/jpeg)
2009-02-24 13:01 UTC, Tim Starling 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Adam Cuerden 2008-09-05 15:38:32 UTC 
The thumbnail generator is producing very, very low quality thumbnails. For instance, look around the flower petals in this thumbnail: http://upload.wikimedia.org/wikipedia/commons/d/d9/Mexican_Sunflower_Tithonia_rotundifolia_Vertical_2000px.jpg  It's created huge amounts of ugliness where the original ( http://upload.wikimedia.org/wikipedia/commons/d/d9/Mexican_Sunflower_Tithonia_rotundifolia_Vertical_2000px.jpg ) has nothing of the sort.
Comment 1 Tim Starling 2008-09-05 15:45:05 UTC 
That is the same URL two times.
Comment 2 Sean Colombo 2008-10-05 19:00:30 UTC 
Here is a link to the page:
http://commons.wikimedia.org/wiki/Image:Mexican_Sunflower_Tithonia_rotundifolia_Vertical_2000px.jpg

And I'm assuming this is the thumbnail:
http://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Mexican_Sunflower_Tithonia_rotundifolia_Vertical_2000px.jpg/80px-Mexican_Sunflower_Tithonia_rotundifolia_Vertical_2000px.jpg

While this isn't spectacular, I'm not sure it's a bug as it might just be the loss-level we have ImageMagick set to.
Comment 4 Tim Starling 2009-02-24 12:59:02 UTC 
Created attachment 5856 [details]
Resized with default options
Comment 5 Tim Starling 2009-02-24 13:01:00 UTC 
Created attachment 5857 [details]
Resized with sharpening
Comment 6 Tim Starling 2009-02-24 13:01:53 UTC 
Created attachment 5858 [details]
Resized with sharpening and reduced quality
Comment 7 Tim Starling 2009-02-24 13:11:12 UTC 
Sharpening adds a slight halo at the edgges of the petals (attachment #5857 [details]). Reducing the JPEG quality adds some blocking artifacts, and creates an increased halo at the petal edges (attachment #5858 [details]). It also reduces the file size by 46%, which of course is the point. It would be helpful to know which of these two processes it is that you're objecting to. But I suspect this is going to be a WONTFIX either way.
Comment 8 Dan Collins 2011-07-15 03:48:57 UTC 
Wontfix per Tim Starling.
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