https://bugs.kde.org/show_bug.cgi?id=402834

            Bug ID: 402834
           Summary: Multiple successive gradients drawn one above other
                    produce undesired banding and color variations
           Product: krita
           Version: git master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: ra...@raghukamath.com
  Target Milestone: ---

Created attachment 117268
  --> https://bugs.kde.org/attachment.cgi?id=117268&action=edit
gradient banding

SUMMARY
When applying multiple successive gradients (foreground to transparency) one
above other, we get bandings and undesired color variations. According to
discussion on IRC this is due to dithering problem.

the bug is seen prominently when working with colors close to black and you
draw it on a new layer. Drawing on an opaque white layer reduces the banding a
bit.

I have attached a png file with multiple gradients you can see banding in the
middle, and if you zoom in you can see reds and greens in the colors. this
becomes a hassle when color picking and painting too.

STEPS TO REPRODUCE
1. Open a New document in Krita, switch color to close to black near red
spectrum.
2. Choose the gradient tool and go and adding radial gradient successively one
above another


OBSERVED RESULT
Bandings appear when applying successive gradients

EXPECTED RESULT
gradients should be dithered and smooth gradation should be produces

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.14.4
Qt Version: 5.12.0
KDE Frameworks Version: 5.53.0

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