https://bugs.kde.org/show_bug.cgi?id=425922
Bug ID: 425922
Summary: Anti aliasing (or average pixels) on the boundary
between image and background when using effects
Product: kdenlive
Version: unspecified
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: secretagent0...@gmail.com
Target Milestone: ---
Created attachment 131254
--> https://bugs.kde.org/attachment.cgi?id=131254&action=edit
Attachment contains image, and how the boundary between it and the background
looks when rotating or changing position
SUMMARY
When using effects (such as rotation or changing position), on the boundary
between image and background, the color is that of a background, with no
contribution from the color of image. That can be seen by moving a picture 5
pixels within 3 frames. So on frame 1, image is in its default position, on
frame 2, its position should be 1.67 pixels to the right, on frame 3 it should
be 3.33 pixels, and on frame 4 it should be 5 pixels to the right. So, on frame
2, the edge of image should participate with 1/3 on the second, and with 2/3 on
the third pixel, but it seems as if it participates with 0 on the second and
2/3 on the third pixel (see attachment, transparent background is rendered as
black). And similarly for frame 3. The same happens if we use rotation.
STEPS TO REPRODUCE
1. Load image (one is provided in the attachment)
2. Change position with Position and Zoom as explained in summary, or rotate
image
3. Set background color
4. Render as Images Sequence (PNG)
OBSERVED RESULT
Described in summary, and can be seen in the attachment.
EXPECTED RESULT
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
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