https://bugs.kde.org/show_bug.cgi?id=361163
Bug ID: 361163
Summary: Newly implemented opacity control of blend modes
produces chroma aberrations
Product: kdenlive
Version: unspecified
Platform: Kubuntu Packages
URL: https://forum.kde.org/viewtopic.php?f=270&t=116876#p35
4253
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: [email protected]
Reporter: [email protected]
With reference to an earlier feature request to add opacity control for the
exisiting transition blend modes https://bugs.kde.org/show_bug.cgi?id=358052
The requested feature was implemented and made available in KDenLive 16.07.70
from the developmental branch ppa:kdenlive/kdenlive-master
On testing the feature however it has been observed that a number of the blend
modes are producing abnormal results with chroma aberrations
Reproducible: Always
Steps to Reproduce:
1. Test system - KdenLive 16.07.70 on Kubuntu 15.10
2. Test video clip - a 1080/29.97p.mts clip from a Canon HF-G10 AVCHD camcorder
transcoded to Matroska.mkv (HuffYUV). Project profile set accordingly.
3. Loaded the clip on the timeline and aligned to the track (Video 1) head.
4. Duplicated and co-aligned the clip on track Video 2
5. Applied Cairo Blend transition between the two tracks, spanning the full
length of the clip.
6. Selected the desired blend mode and adjusted the opacity using the slider.
7. Observed the result at the set opacity and took a screen shot of the frame
off the Project Monitor view.
8. Compared the results with those obtained with scripted AVISynth function
that applies the same blend mode operations.
Actual Results:
The results are demonstrated in full in this post on the KDenLive forum:
https://forum.kde.org/viewtopic.php?f=270&t=116876#p354253
In summary: The Overlay, Hardlight, Softlight, Screen and Color Dodge blend
modes produced a similar pattern of chroma aberrations which appeared when the
opacity was set to 50% or more and increased in severity up to 100% opacity.
With the Add blend mode these aberrations progressively increased in severity
over the entire 0 - 100% opacity range.
Expected Results:
It was expected that the blend mode operations would produce the intended
effect, without these chroma aberrations.
--- Comment #1 from [email protected] ---
*** Bug 361164 has been marked as a duplicate of this bug. ***
--- Comment #2 from [email protected] ---
*** Bug 361165 has been marked as a duplicate of this bug. ***
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