https://bugs.kde.org/show_bug.cgi?id=455918
Bug ID: 455918
Summary: If you downscale the video/image using Kdenlive's
effect or composition, it will destroy image's quality
Product: kdenlive
Version: 21.12.2
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: kzo...@protonmail.com
Target Milestone: ---
Created attachment 150145
--> https://bugs.kde.org/attachment.cgi?id=150145&action=edit
This archive contains .pdf report and 3 images
SUMMARY
The report title already says, what is the problem.
But TLDR - Kdenlive's effect "Transform" (and composition), when scaling down
the picture, does not take in consideration all the pixels. It takes in
consideration only the "closest pixel/s". This leads to crippled image quality,
because majority of pixels are ignored. This should not happen and has been in
Kdenlive for a very very long time.
In attachment I have added a .pdf report and the image files, which were used
in the test. I made a .pdf report, because in order to describe the problem in
detail, you have to read and look at the comparison pictures.
STEPS TO REPRODUCE
1. Read the .pdf report pls
2. Read the .pdf report pls
3. Read the .pdf report pls
OBSERVED RESULT
Image with destroyed quality
EXPECTED RESULT
Image without destroyed quality
SOFTWARE/OS VERSIONS
Ubuntu 22.04
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