https://bugs.kde.org/show_bug.cgi?id=506510
Bug ID: 506510
Summary: Gaussian and Directional Blur don't affect alpha
Classification: Applications
Product: kdenlive
Version First 25.04.1
Reported In:
Platform: Flatpak
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Video Effects & Transitions
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Kdenlive 25.04.02
SUMMARY
Gaussian Blur and Directional Blur are constraint to visible pixels when
blurring.
The blur does not spill into alpha channel of image or title clips.
STEPS TO REPRODUCE
1. Create Title clip, add red text, leave background transparent.
2. Add title clip to timeline.
3. Apply Gaussian blur with Sigma & Vertical Sigma ~80.
4. Increase Gaussian blur Sigma & Vertical Sigma to ~320
OBSERVED RESULT
The text will blur inwards, pulling in the alpha (dark) onto the text.
Once blur reaches ~320, the red text will turn white.
EXPECTED RESULT
For the text to blur outwards and all-over. For the blur to reflect the blurred
image colors.
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: 6.13.0
Qt Version: 6.9.0
ADDITIONAL INFORMATION
Although the red text won't turn white with the Directional Blur, it will turn
black as the alpha gets pulled in and the blur remains contained within the
visible pixels.
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