Bug 123608

Summary:	Transparent PNG images are not really transparent if embedded gwenview viewing is enabled
Product:	[Applications] gwenview	Reporter:	Lari Temmes <larppaxyz>
Component:	general	Assignee:	Gwenview Bugs <gwenview-bugs-null>
Status:	RESOLVED FIXED
Severity:	wishlist	CC:	huon, null
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Lari Temmes 2006-03-14 12:44:01 UTC

Version:            (using KDE KDE 3.5.1)
Installed from:    Ubuntu Packages
OS:                Linux

Some PNG images with alpha channel (not sure if this affects GIF images also) don't show up correctly if embedded viewer for images is gwenview. 

If i go to :

Settings -> File associations -> image/png -> Embedding 

And move "Embeddable Image Viewer" to top it works ok. With "Gwenview Image Viewer" it doesn't.

I'm not sure if this is distro specific (configuration) problem, but it's small problem anyway. 

This happens with kubuntu breezy/dapper kde 3.5.1 which installs gwenview by default. Not sure if this happens with other distros.

Uninstalling gwenview also solves this problem.

Screenshot :

http://www.sellu.org/gwenviewproblem.png

Grey box should appear transparent. Image comes from my adblocker.

Comment 1 Huon 2018-04-23 03:55:56 UTC

I don't know if I'm testing properly, but I'm opening a PNG with transparency in Konqueror (from DuckDuckGo search results). With either Gwenview Image Viewer or Embeddable Image Viewer at the top, the background shows as a checkerboard pattern.

So either I'm doing something wrong, or this has been fixed in the last 12 years...

Comment 2 null 2018-04-23 11:14:58 UTC

In fact, even with a Qt3/KDE3-based Gwenview I see the checkerboard right now, meaning perhaps this was fixed a long time ago in Gwenview, in some underlying library, or the problem happens only with specific files (sadly no testcase attached to the bug to try it out…).

@Huon: In general feel free to close bugs where you are pretty sure about your analysis. We can always reopen if it turns out to be an error.