Re: [Gimp-developer] something wrong with healing brush

On 10/06/2017 02:26 AM, Alexander Rabtchevich wrote:

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:

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.


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