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Add Grayscale color picking mode to GimpColorFrame

Alx Sa requested to merge alxsa-color-picker-grayscale into master

Inspired by an IRC conversation with @Jehan, this patch attempts to add a Grayscale (%) color picking mode to GimpColorFrame (used by the color picker info window, Sample Points dialogue, and Pointer dialogue). Note that it does not yet use the image's GimpColorProfile - that will be implemented in the revised !775 (closed).

Question: Should the color area's display color be converted to grayscale as well? E.g. If I put a sample point on RGB (111, 157, 243) with an RGB image, should the Grayscale color area show that as blue or its converted grayscale color?

Keeping the color area the same as RGB

image

Changing color area to match Grayscale version of that value

image

Edited by Alx Sa

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