Bug 233896 - Very poor quality low-pass filters (poor resampling/thumbnails quality)
Summary: Very poor quality low-pass filters (poor resampling/thumbnails quality)
Status: RESOLVED FIXED
Alias: None
Product: gwenview
Classification: Applications
Component: general (other bugs)
Version First Reported In: 2.9.4
Platform: Ubuntu Linux
: NOR normal
Target Milestone: ---
Assignee: Gwenview Bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-04-09 23:52 UTC by Michał
Modified: 2017-11-15 22:54 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
Test image (21.40 KB, image/png)
2010-04-09 23:52 UTC, Michał 		Details
KDE 3 (left) and KDE 4 (right) Gwenviews compared. Actual zoomed image in the center. (145.41 KB, image/png)
2010-04-09 23:53 UTC, Michał 		Details
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Description Michał 2010-04-09 23:52:19 UTC 
Version:           2.4.2 (from KDE 4.4.2) (using KDE 4.4.2)
OS:                Linux
Installed from:    Archlinux Packages

Compared to Gwenview from KDE 3.5, version 4 has very poor resampling quality, even poorer than Gwenview 3.5 had on "lowest quality" setting. This applies not only to thumbnails, but also for normal full-screen rendering. I attached simple test image and screenshot showing Gwenview from KDE 3.5 and from KDE 4.4.

Expected behaviour is to have smooth gray image. Current Gwenview displays visible aliasing or event plain white pages (please use test file to check how Gwenview from KDE 3.5 and 4 behaves on different zoom levels).
Comment 1 Michał 2010-04-09 23:52:50 UTC 
Created attachment 42634 [details]
Test image
Comment 2 Michał 2010-04-09 23:53:34 UTC 
Created attachment 42635 [details]
KDE 3 (left) and KDE 4 (right) Gwenviews compared. Actual zoomed image in the center.
Comment 3 Alexander Potashev 2014-10-29 13:27:57 UTC 
I confirm this on Gwenview "4.14.0 pre" with KDELibs 4.14.1 on Fedora 20.
Comment 4 Nate Graham 2017-11-10 17:17:20 UTC 
Seems fixed in Gwenview 16.x and later.
Comment 5 Michał 2017-11-10 18:38:02 UTC 
Indeed. Doesn't take gamma into account, but most viewer's don't and that's a minor issue.
Comment 6 Nate Graham 2017-11-10 18:39:08 UTC 
Yes, and the Gamma issue is tracked with https://bugs.kde.org/show_bug.cgi?id=349067
Comment 7 Christoph Feck 2017-11-15 22:54:35 UTC 
Bug 349067 talks about gamma values stored in the file, while the reporter meant http://www.ericbrasseur.org/gamma.html