Bug 446000

Summary:	Digikam does not generate thumbnails for some images
Product:	[Applications] digikam	Reporter:	Alain Knaff <kde>
Component:	Database-Thumbs	Assignee:	Digikam Developers <digikam-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	metzpinguin
Priority:	NOR
Version First Reported In:	7.1.0
Target Milestone:	---
Platform:	Debian stable
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	7.4.0
Sentry Crash Report:

Description Alain Knaff 2021-11-23 21:07:24 UTC

SUMMARY

I have this image here (see attachment), for which digikam does not generate a thumbnail. It is not a matter of size, as it *does* work if I convert it to an even bigger size using imagemagick.
It also works with table view (I can click on the image's table entry and see the big one), just not with preview or thumbnail.

STEPS TO REPRODUCE
1. Store this picture in an album watched by digikam (i.e. where other pictures are already visible)

OBSERVED RESULT

A thumbnail of this pix should appear

EXPECTED RESULT

Nothing happens

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.78.0-3
(available in About System)
KDE Plasma Version: 5.20.5-1
KDE Frameworks Version: 5.78.0-2
Qt Version: 5.15.2-5

ADDITIONAL INFORMATION

Comment 1 Maik Qualmann 2021-11-23 21:23:27 UTC

Well I am sure that if you send aimage it will work here. The Debian digiKam package is out of date, in between there are hundreds of fixed bugs in the last stable digiKam-7.3.0. Also, is the Debian package a snap image, like Ubuntu's? Snap packages use a sandbox and are unusable. please test it with our AppImage from www.digikam.org. 

Maik

Comment 2 Alain Knaff 2021-11-23 21:36:29 UTC

(In reply to Maik Qualmann from comment #1)
> Well I am sure that if you send aimage it will work here. The Debian digiKam
> package is out of date, in between there are hundreds of fixed bugs in the
> last stable digiKam-7.3.0. Also, is the Debian package a snap image, like
> Ubuntu's? Snap packages use a sandbox and are unusable. please test it with

no snap here, sorry

> our AppImage from www.digikam.org. 

I tried this, and indeed it worked.

But now the surprising part: it still continued working after I then viewed the album with my normal Debian digikam, and even after I renamed my picture, and then moved it to another album. Weird. Unfortunately, this is the only image of this kind that I have around, so I've got no further opportunity to test :-(

> 
> Maik

Thanks,

Alain

Comment 3 Maik Qualmann 2021-11-23 21:43:05 UTC

Remember that the AppImage has now created a thumbnail in the DB. Therefore your Debian version now also shows a thumbnail. Renaming is not enough, as the thumbnails are found in the DB with a hash. You would have to delete the thumbnail DB as a test.

Maik

Comment 4 Maik Qualmann 2021-11-25 21:16:49 UTC

Since the problem with the AppImage could be fixed, I close the bug. If the problem occurs again, reopen the bug.

Maik