https://bugs.kde.org/show_bug.cgi?id=463585
Bug ID: 463585
Summary: Visible banding with gradient map filter, even on high
bit depth canvas
Classification: Applications
Product: krita
Version: 5.1.4
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Filter Layers
Assignee: krita-bugs-n...@kde.org
Reporter: qamp...@hotmail.com
Target Milestone: ---
Created attachment 154877
--> https://bugs.kde.org/attachment.cgi?id=154877&action=edit
Visible banding on gradient after the filter is applied
SUMMARY
Using Gradient Map filter (either from Filter > Map, or Filter Layer) produces
a visible banding, even on a higher bit depth canvas (16bpc). Segment and Stop
gradient produces the same result.
STEPS TO REPRODUCE
1. Create new document, preferably at 16bpc
2. Create a simple gradient (eg. Black -> White)
3. Add Gradient Map with a same gradient as before
OBSERVED RESULT
Visible banding occurred on the gradient (attached image)
EXPECTED RESULT
Gradient should be smooth, or at least as smooth as the original layer.
SOFTWARE/OS VERSIONS
Windows: 10 Pro 21H2
Qt Version: 5.12
ADDITIONAL INFORMATION
It seems like the Gradient Map filter is processed with 8-bit precision
regardless of the canvas bit depth. This can be observed by picking up the
color on the gradient. The original gradient have a smooth transition, while
the filtered one will have a bigger steps.
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