Lab is very interesting for photo retouch because Luminosity (better said Luminance) is separated from colors. It is the most complete color model so that Photoshop uses it when you want to change the color mode. +> gives more precise result. But out of that, it is much more difficult to conceive things with L*a*b. Gimp does not implement it except in the Decompose Filter. May be another thing to do :)

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