https://bugs.kde.org/show_bug.cgi?id=422479
Bug ID: 422479
Summary: B&W picture, with only B&W layers, will produce colors
from nowhere after Grayscale to RGB colorspace
conversion
Product: krita
Version: 4.2.9
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Layer Stack
Assignee: krita-bugs-n...@kde.org
Reporter: to...@offensivelytolerant.com
Target Milestone: ---
Created attachment 129070
--> https://bugs.kde.org/attachment.cgi?id=129070&action=edit
A workfile showing the issue : made from a base white layer, and a layer group
containing a black layer, everything with regular blending mode, it shows plain
yellow color in the canvas.
SUMMARY
I had a work file using a grayscale color space (can't remember which one
exactly), that I needed to convert to RGB color space. After that, canvas
showed colors, exported color, etc, despite workfile containing only grayscale
values (down to only black and white regular layers).
It seems like colorspace conversion corrupted some layer groups (???) to make
them output colors, because creating layers with value of grey inside these
layer groups will lead to color values (plain color like yellow if layers
inside are black) at the end. Newly created layer groups don't have the issue.
Also saw it happen when moving a grayscale layer stack from a grayscale work
file into a RBG color file (target file was 16 bits floating point precision at
this time)
Appears on Parabola Linux, on a Thinkpad x230 with a Intel chipset.
STEPS TO REPRODUCE
1. Open YellowBug.kra and see the result : canvas is yellow. But the workfile
itself only contains a white layer used as a background, a layer group ("PBR")
on top blended with Normal mode, and a black layer blended with Normal mode in
it.
2.Change the color of the layer inside PBR, or create a new layer in it after
emptying it and put any color in it : result will be somewhere between yellow
and white.
3.Disable PBR, create a new layer group on top of the bottom layer, and put
things in it (or even move the content of "PBR" inside the new layer group) :
everything behaves the way it should.
OBSERVED RESULT
Any color used in the "PBR" layer group is displayed as a tint of yellow.
EXPECTED RESULT
Any color used in the "PBR" layer would be displayed as it has been set inside
the layer, because it's on top of the stack
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Parabola
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
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