https://bugs.kde.org/show_bug.cgi?id=471350

            Bug ID: 471350
           Summary: Cross-Channel filter uses Blue instead of Red
    Classification: Applications
           Product: krita
           Version: nightly build (please specify the git hash!)
          Platform: macOS (DMG)
                OS: All
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Filter Layers
          Assignee: krita-bugs-n...@kde.org
          Reporter: razin...@gmail.com
  Target Milestone: ---

Created attachment 159838
  --> https://bugs.kde.org/attachment.cgi?id=159838&action=edit
KRA file with error

SUMMARY
***

I trying to make layer transparent based on RGB channel. So i set
Alpha-driven-from-RED channel curve. But filter actually uses BLUE channel
value to drive alpha.

***

STEPS TO REPRODUCE
1. Open attached KRA file
2. Open Cross-channel mask filter and alter channels

OBSERVED RESULT
Alpha drived by improper channel

EXPECTED RESULT
Alpha drived by proper channel

SOFTWARE/OS VERSIONS
Krita

 Version: 5.2.0-prealpha (git 6d578e3)
 Hidpi: true

Qt

  Version (compiled): 5.15.7
  Version (loaded): 5.15.7

OS Information

  Build ABI: x86_64-little_endian-lp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: darwin
  Kernel Version: 22.5.0
  Pretty Productname: macOS 13.4
  Product Type: osx
  Product Version: 13.4

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