On 10/06/2017 02:26 AM, Alexander Rabtchevich wrote:
Hello
It seems healing brush is broken. It produces artifacts and the result
is not as before. I guess it happened when color transform code was
involved, but that's only a supposition.
See this bug report: https://bugzilla.gnome.org/show_bug.cgi?id=783755
The healing tool uses Subtract to calculate color differences, which
only produces expected results when using RGB encoded more or less
perceptually. But using Subtract on perceptually uniform RGB does
produce obvious gamma artifacts in extreme cases that maybe would never
come up in normal editing.
Regardless of the extreme cases, if Subtract is used to calculate color
differences, the healing tool should use perceptually uniform RGB. But
instead of using Subtract, it might be better to use LAB to calculate
color differences.
Best,
Elle
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