Bug 333733 - Allow adjusting the chroma sampling parameters
Summary: Allow adjusting the chroma sampling parameters
Status: CONFIRMED
Alias: None
Product: gwenview
Classification: Applications
Component: general (show other bugs)
Version: Other (add details in bug description)
Platform: unspecified Linux
: NOR wishlist
Target Milestone: ---
Assignee: Gwenview Bugs
URL: https://bugreports.qt.io/browse/QTBUG...
Keywords:
Depends on:
Blocks:
 
Reported: 2014-04-22 16:07 UTC by DrSlony
Modified: 2019-09-17 18:22 UTC (History)
3 users (show)

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Description DrSlony 2014-04-22 16:07:41 UTC 
GwenView should let the user set compression and chroma sampling when saving images, especially in the case of JPEG images.
Comment 1 DrSlony 2014-09-15 13:46:10 UTC 
Still valid for 4.14.0 (that version is not available in the "version" combobox).
Comment 2 Nate Graham 2017-09-09 04:08:26 UTC 
Indeed. Or at least just compression/quality level.
Comment 3 Nate Graham 2017-09-09 04:48:50 UTC 

*** This bug has been marked as a duplicate of bug 294594 ***
Comment 4 DrSlony 2017-09-11 12:58:36 UTC 
This request is not a duplicate of bug 294594.

Gwenview should let the USER select both the compression level and in the case of JPEG the chroma subsampling used.
Comment 5 Nate Graham 2017-09-11 13:27:02 UTC 
You're right!
Comment 6 Nate Graham 2017-09-11 13:40:38 UTC 

*** This bug has been marked as a duplicate of bug 277996 ***
Comment 7 DrSlony 2019-08-26 16:11:35 UTC 
For more info, see https://bugs.kde.org/show_bug.cgi?id=277996#c14
Comment 8 Christoph Feck 2019-09-17 18:03:07 UTC 
QImage doesn't support changing chroma sub-sampling, see https://bugreports.qt.io/browse/QTBUG-901
Comment 9 Nate Graham 2019-09-17 18:22:42 UTC 
Darn, looks like the feature was rejected. :(

Without support in Qt, it's very unlikely we'll be able to implement this on our own, at least not until an image manipulation expert comes along and writes it from scratch and ports Gwenview to use it (preferably this person would add it to Qt though).