https://bugs.kde.org/show_bug.cgi?id=526271

            Bug ID: 526271
           Summary: Filter Brush with Dodge/Burn produces white output on
                    Mirror side
    Classification: Applications
           Product: krita
      Version First 5.3.4
       Reported In:
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Tools
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 196591
  --> https://bugs.kde.org/attachment.cgi?id=196591&action=edit
Filter Brush with Burn produces white output on Mirror side

When using the Filter Brush in Dodge or Burn mode with the Mirror tool enabled,
the mirrored stroke produces a solid white result instead of the expected
dodge/burn effect.

Steps to reproduce:
1. Create a new image with a mid-tone base layer (e.g. 50% gray).
2. Select the Filter Brush tool.
3. Set the filter to Dodge (or Burn).
4. Enable Mirror (via Canvas → Mirror, or the mirror toggle in the tool
options).
5. Paint a stroke on one side of the mirror axis.

Expected result:
The mirrored stroke on the opposite side should show the same dodge/burn effect
as the original stroke.

Actual result:
The mirrored stroke appears as a solid white area instead of the expected tonal
change.

Additional notes:
The non-mirrored side works correctly.
Reproducible with both Dodge and Burn modes.
Switching the brush blend mode from Copy (default for this filter brush) to
Normal eliminates the white output on the mirror side, but the dodge/burn
effect also does not appear there.

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