https://bugs.kde.org/show_bug.cgi?id=396244

            Bug ID: 396244
           Summary: Cross-channel color adjustment goes plain red
           Product: krita
           Version: 4.1.0
          Platform: Appimage
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Filter Layers
          Assignee: krita-bugs-n...@kde.org
          Reporter: chameleonsca...@protonmail.com
  Target Milestone: ---

When setting a cross-channel color adjustment layer (or mask) to channel:
Saturation and Driver channel: Hue
every pixel of the original image that has 0 saturation becomes plain red as
soon as we tweak the curve no matter how.

Steps to reproduce:
1. Create a new Krita document
2. Add some brush strokes of grays with 0 saturation and some brush strokes
with a very slight color saturation.
3. Add a filter layer or filter mask
4. Set it to Cross-channel color adjustment
5. Set Channel to Saturation and Driver channel to Hue
6. add a point to the curve and move it in any direction: the white canvas
becomes plain red and the grey strokes have plain red multiplied in them too.

My GPU: Nvidia GeForce 820M with proprietary driver on Linux Mint.

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