https://bugs.kde.org/show_bug.cgi?id=444660
Bug ID: 444660
Summary: The result of the color adjustment curve under the 16
bit channel is incorrect
Product: krita
Version: 5.0.0-beta2
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Filters
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
When the color profile of the canvas is 16-bit lrgb(gamma 1.0), the result of
the color adjustment curve is the same as that when the color profile is 8-bit
srgb(gamma 2.2). The result is not calculated according to the lrgb value, but
according to the srgb value.
STEPS TO REPRODUCE
1. Create a canvas with 16-bit lrgb color profile
2. Draw any color and select anThe adjustment results of hue, saturation or
brightness channels are the same in differe area with the selection tool, open
the color adjustment curve in the color filter, select the lightness channel,
and adjust the rightmost end of the curve to any value
3. Convert the canvas to an 8-bit srgb color profile file, and repeat the
second step. It is found that the adjustment results are the same for the same
color.
OBSERVED RESULT
The adjustment results using hue, saturation or lightness channel for the same
color are the same in different color profiles
EXPECTED RESULT
In a canvas with a 16-bit lrgb color profile, when adjusting the color using
the hue, saturation or lightness channel of the color adjustment curve, the
result should be the same as that of the cross channel color adjustment curve
using the same channel for the adjustment channel and the drive channel, not
the same as that of the canvas with an 8-bit srgb profile.
SOFTWARE/OS VERSIONS
Windows: 5.0.0-beta2
ADDITIONAL INFORMATION
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