Bug 140768 - Scaling quality of images degraded since tdf#138068
Summary: Scaling quality of images degraded since tdf#138068
Status: RESOLVED DUPLICATE of bug 140755
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: graphics stack (show other bugs)
Version:
(earliest affected)
7.2.0.0.alpha0+
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-03-03 07:28 UTC by Tomaz Vajngerl
Modified: 2021-03-25 22:51 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:

Attachments
Document whcih demonstrates bad scaling (256.81 KB, application/vnd.oasis.opendocument.text)
2021-03-03 07:28 UTC, Tomaz Vajngerl 		Details
Scaling in LO 7.0 and now (774.92 KB, image/png)
2021-03-03 07:46 UTC, Tomaz Vajngerl 		Details
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Description Tomaz Vajngerl 2021-03-03 07:28:49 UTC 
Created attachment 170190 [details]
Document whcih demonstrates bad scaling

I noticed that scaling of my PNG images is quite bad in master when I was writing my blog. I confirmed by reverting the patches that since tdf#138068 [1] the quality of scaling got worse - at least with the GTK3 + cairo backend (didn't try others backends). Looks like it does just a simple bi-linear interpolation even when scaling down more than a factor of 0.5. 


[1] https://bugs.documentfoundation.org/show_bug.cgi?id=138068
Comment 1 Tomaz Vajngerl 2021-03-03 07:46:30 UTC 
Created attachment 170191 [details]
Scaling in LO 7.0 and now
Comment 2 Telesto 2021-03-03 07:56:10 UTC 
Bug 138684 (import) might be related.. Some other issues at the export side bug 140465 (export/ bug 125970 (export)
Comment 3 Xisco Faulí 2021-03-03 08:10:38 UTC 
It looks like a duplicate of bug 140755

*** This bug has been marked as a duplicate of bug 140755 ***