https://bugs.kde.org/show_bug.cgi?id=465851
Bug ID: 465851
Summary: Images look slightly blurry with zoom level < 100%
Classification: Applications
Product: gwenview
Version: 20.08.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: jan.rathm...@gmx.de
Target Milestone: ---
Created attachment 156309
--> https://bugs.kde.org/attachment.cgi?id=156309&action=edit
Patch to make Gwenview render images more sharply
SUMMARY
Some images (photos) look slightly blurry when they are displayed with a zoom
level < 100% (this is the default if I simply open an image file that has a
higher resolution than my screen).
STEPS TO REPRODUCE
1. Open a photo in Gwenview with small, fine-grained details.
OBSERVED RESULT
Photo looks slightly blurry.
(see attached screenshot, view at 100%)
EXPECTED RESULT
Photo looks "sharp".
(see attached screenshot of the same image displayed by Firefox, view at 100%)
ADDITIONAL INFORMATION
I discovered this problem by developing RAW files in darktable, wondering why
the image looks sharp in darktable but a bit blurry in Gwenview.
I compared the rendering of Gwenview with:
* Firefox
* digiKam
* Eye of Gnome
On all of them it looks "good/sharp".
I get a sharp rendering in Gwenview by replacing Qt::SmoothTransformation with
Qt::FastTransformation in one function, see attached patch.
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