Bug 475843 - CMYK Adjust effect values for Reds, Yellow, and Magentas are inverted (negatives increase, positives decrease intensity)
Summary: CMYK Adjust effect values for Reds, Yellow, and Magentas are inverted (negati...
Status: CONFIRMED
Alias: None
Product: kdenlive
Classification: Applications
Component: Video Effects & Transitions (show other bugs)
Version: 23.08.1
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Jean-Baptiste Mardelle
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-10-19 19:59 UTC by Bernd
Modified: 2023-10-28 10:14 UTC (History)
1 user (show)

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Description Bernd 2023-10-19 19:59:15 UTC 
SUMMARY
CMYK Adjust effect (avfilter.selectivecolor) values for Reds, Yellows and Magentas are inverted: positive values reduce the color intensity/saturation, negative values increase it

STEPS TO REPRODUCE
1. Create a red, a yellow and a magenta color clip
2. Apply a CMYK effect and change the values for Reds, Yellows, and Magentas, respectively

OBSERVED RESULT
Positive values decrease saturation, negative values increase

EXPECTED RESULT
the other way around

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Pop!_OS 22.04
KDE Frameworks Version: 5.92
Qt Version: 5.15.3

ADDITIONAL INFORMATION
MLT 7.20.0
Comment 1 diekuhrannte@web.de 2023-10-28 10:14:46 UTC 
Yes, the error is exactly as described here.
However, you can still use this effect without restrictions, you just have to know that the sliders work the other way around for Reds, Yellows and Magentas.