Last modified: 2012-02-22 12:36:24 UTC

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Bug 16785 - Switch in bicubic image scaling for client-side thumbnailing in Internet Explorer 7
Switch in bicubic image scaling for client-side thumbnailing in Internet Expl...
Product: MediaWiki
Classification: Unclassified
File management (Other open bugs)
All All
: Low enhancement (vote)
: ---
Assigned To: Nobody - You can work on this!
: testme
Depends on:
Blocks: 640
  Show dependency treegraph
Reported: 2008-12-24 23:07 UTC by Brion Vibber
Modified: 2012-02-22 12:36 UTC (History)
2 users (show)

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

Screen shot IE7 with full-page zoom showing ugly pixels (163.89 KB, image/png)
2008-12-24 23:07 UTC, Brion Vibber

Description Brion Vibber 2008-12-24 23:07:03 UTC
Created attachment 5620 [details]
Screen shot IE7 with full-page zoom showing ugly pixels

In some circumstances, raster images can get scaled up or down on the client side:

* Small source image scaled up to a large size [[Image:Tiny.png|300px]]
* GIF image over $wgMaxAnimatedGifArea
* Any image scaled on server with no GD or ImageMagick scaling engine available
* Any image when browser's full-page zoom is used

Many modern browsers use a pretty scaling method, but by default Internet Explorer uses nearest-neighbor which looks awful.

Apparently, IE 7 can switch in bicubic scaling via a simple bit of custom CSS:

If there aren't unpleasant side effects it may be wise to use this.

IE 6 can perhaps do this with the scary filter we're using for Alpha PNGs or a variant, but it's probably not worth expending effort on IE 6 at this point.
Comment 1 Siebrand Mazeland 2009-06-04 11:08:03 UTC
Update Web browser.
Comment 2 Siebrand Mazeland 2009-06-04 11:35:36 UTC
Adding testme. Please test with Internet Explorer 8 and note the result here.
Comment 3 Brion Vibber 2009-09-23 21:20:32 UTC
IE8 seems to be using bicubic scaling by default, which looks much better. (Tested 8.0.6001.18702 on XP SP2 32-bit under VMware.)
Comment 4 Brion Vibber 2011-10-05 19:24:25 UTC
I don't think we're gonna bother doing this, nobody likes IE7 and later versions have fixed it upstream. ;)

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