https://bugs.kde.org/show_bug.cgi?id=384367

            Bug ID: 384367
           Summary: Channels docker lacks key functionality
           Product: krita
           Version: 3.2.0-beta.2
          Platform: MS Windows
               URL: https://forum.kde.org/viewtopic.php?f=83&t=141175
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: usability
          Assignee: krita-bugs-n...@kde.org
          Reporter: gnd...@gmail.com
  Target Milestone: ---

https://forum.kde.org/viewtopic.php?f=83&t=141175

I was private messaged to add this to the bug tracker, as well as a summary. 

Summary: 

Channels docker should allow the following and does not. 

A.) Selection tools need to use the black and white channel image for their
logic and computation if you are in a single channel or combination of channels
rather than sample the original full color image. Useful when removing
greenscreen or photoblue backrounds from art. Useful in lineart to grab ink,
but not blue pencil from scans too. 

As it stands now, you're forced to junk through hoops to get these selections.
Such as merging all your layers, then taking the merged master and dividing
that into three channels. Then sometimes having to apply an alpha. 

B.) Painting on in channels mode should only paint in the active channels. A
mark made in the red channel with blue and green hidden should not contribute
to marking blue and green as well. This functionality is needed for normal-map
touchups.

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