https://bugs.kde.org/show_bug.cgi?id=392645
Bug ID: 392645
Summary: 4.0.0 and 4.1.0 pre-alpha: Colour Picker fault with
32-bit float colour depths.
Product: krita
Version: nightly build (please specify the git hash!)
Platform: Debian stable
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Color models
Assignee: krita-bugs-n...@kde.org
Reporter: ahab.greybe...@hotmail.co.uk
Target Milestone: ---
Created attachment 111787
--> https://bugs.kde.org/attachment.cgi?id=111787&action=edit
Screenshot from 4.1.0 pre-alpha, shows the effect
This problem is present in the 4.0.0 and 4.1.0 pre-alpha (b6620443) for 32-bit
float colour depth. 16-bit float and other depths do not have this problem. It
is not present in the 3.3.3 release.
If a new image is created with the default 32-bit floating point colour space,
colours can be chosen normally with the 'colour wheel' and the Specific Colour
Selector dockers.
If the Colour Picker tool is used (using Cntrl-click or the tool from the
Toolbox) then the colour wheel shows the correct colour (usually, but see
below) but the Specific Colour Selector shows a very transparent colour on its
sliders.
The resulting brushstroke is of the chosen colour but with miscoloured parts.
The attachment shows a full screenshot taken from the 4.1.0 pre-alpha. The
colour for each upper line for each colour was selected using the colour wheel.
The lower line was selected using the colour picker tool.
Note that the blue colour, when picked from, gives a green result and this
green was also shown in the colour wheel appearance at the time. All coloured
lines show patches of miscolouring.
The Specific Colour Selctor indicates transparency.
The colour picker does not show a coloured square after picking (or maybe it
shows a transparent square).
With the 4.0.0 appimage, the painted line (using the colour picker) is usually
transparent but sometimes is of a different colour with large gaps in the
painted stroke.
The mitigation for this is to not use the colour picker but to use the colour
wheel or the Specific Colour Selector.
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