https://bugs.kde.org/show_bug.cgi?id=409627
Bug ID: 409627
Summary: Implement a Blending Mode corresponding to SAI's
Luminosity/Shine mode
Product: krita
Version: 4.2.2
Platform: Other
OS: All
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: Layer Stack
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
SAI's "Luminosity (SAI1)" or "Shine (SAI2)" layer blending mode is widely used
by the newer generation of digital artists. This blending mode is useful
because it can easily create highlight effect that looks vividly colorful in
the gradient part while clipping to a colored white at the extremes, loosely
resembling that of the natural lighting. It's one of SAI's killer feature and
has been mentioned again and again as one of the major reasons for which SAI
artists are unwilling to adopt Krita or even Photoshop, despite knowing the
alternatives are superior in almost every other way. It'd be nice for Krita to
implement such a feature.
We can recreate such effect in the current version of Krita using 2 different
workarounds:
Method A:
1) Create a new layer above the base color layer
2) Set layer blending mode as "Addition" or "Linear Dodge"
3) Fill this layer with pure black
4) Paint highlight effect with very bright colors
Method B:
1) Create a new group layer above the base color layer
2) Set blending mode of the group as "Addition" or "Linear Dodge"
3) Create a new fill layer inside the group, fill color set to black
4) Above the fill layer, create a new normal layer
5) Paint highlight effect with very bright colors
Additional information:
You can do this in Photoshop by using "Linear Dodge" with "Transparent Shape
Layer" box unchecked in Layer Properties.
I suspect that this "feature" of SAI is actually a happy accident, resulted by
SAI treating 100% transparent pixels as pure black (0,0,0) when doing color
maths. The way the extreme white parts clip resembles that of a characteristic
sRGB gamma corrected value curve. And because sRGB gamma corrected value curve
is created after how human perceives value, it explains quite well why this
blending mode looks so appealing.
I will attach demonstration images later.
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