https://bugs.kde.org/show_bug.cgi?id=389555

            Bug ID: 389555
           Summary: Complex transparency mask usage and layer behavior
                    flexibility
           Product: krita
           Version: git master
          Platform: unspecified
                OS: unspecified
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: Layer Stack
          Assignee: krita-bugs-n...@kde.org
          Reporter: l...@shitmail.de
  Target Milestone: ---

At the moment this is more of a problem looking for possible solutions than an
actual proposal. (Maybe (special) layers overall need a lot of work with how
they interact and work)

I'm doing some manga scanlation editing and I'm working on coming up with a
structured workflow. I'm using one transparency masks to erase out text and
another to erase out blemishes that remain after some filtering. I just have a
plain white layer as a background.

What I'd like is to be able to have different colored high contrast
highlighting to audit what I've done using the transparency masks. At the
moment my solution only works with one color, so I cant really have an overview
showing the different edits I did with different layers.

I'm very impressed with the special layers for nondestructive editing that
Krita provides, though somewhat lacking in polish at the moment.
My current solution is that I added a sharp red colorize mask to the background
layer, for which I enable and disable the visibility if I want to emphasize
erased areas. So this shows through the transparent areas.

I tried messing around with various variations on cloning transparency masks
xor converting layer clones to transparency masks, but neither of these seems
to work as I want.

Cloning a transparency mask results in cloning the parent of the transparency
mask, not the individual transparency mask (there also seems to be some odd-ish
refresh behavior here which I will open a bug for soon). Alternatively, if I
create a separate layer that I clone and convert to a transparency mask, the
conversion results in the relationship with the original layer not being
preserved and losing the data, just being a completely empty transparency mask.

Turning something into a mask, or turning a mask into something, would I think
exhaustively cover the possible ways to do this via layers, so something would
have to be done about at least one of these for this to work. Alternatively
maybe the color that can be assigned to a layer in the right click menu could
be used for something like this, but I think that would be less flexible.

I will attach an example once I can get my colorize mask working properly
again. I think something might have broken when I updated to master. I'm
probably abusing is as well.

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