Bug 497969

Summary: Second Transform effect automatically makes image blurry.
Product: [Applications] kdenlive Reporter: nuxttux
Component: Video Effects & TransitionsAssignee: Jean-Baptiste Mardelle <jb>
Status: RESOLVED DUPLICATE    
Severity: normal CC: aristsakas, berndmj
Priority: NOR Keywords: triaged
Version First Reported In: 24.12.0   
Target Milestone: ---   
Platform: Flatpak   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description nuxttux 2024-12-28 08:49:35 UTC 
SUMMARY
After scaling down an image to 40% or below, using the Transform effect, adding a second Transform automatically makes the image blurry.

STEPS TO REPRODUCE
1. Add Transform effect to image clip (on timeline).
2. Scale down to 50% (or 20% for more pronounced results).
3. Add a second Transform effect (leave it on default).

OBSERVED RESULT
Image automatically becomes blurry when the second transform is added.

EXPECTED RESULT
That the image retains it's quality (until changes are made to the second transform).

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 6.9.0
Qt Version: 6.7.3

ADDITIONAL INFORMATION
The lower the scale percentage of the first Transform effect the more pronounce the blur is after adding the second Transform. This applies to videos as well.
Comment 1 Bernd 2024-12-28 17:05:21 UTC 
This is also the case when using the built-in effects: scale down to 20%, add a Transform effect, and the image/frame in the project monitor  (set to 1:1) changes (loses details, becomes blurry). Tested with 24.12.0 on Pop!_OS 22.04 LTS.
Comment 2 aristsakas 2026-01-08 12:03:58 UTC 

*** This bug has been marked as a duplicate of bug 488742 ***