I’m using your great skin detection filter in GMIC quite extensively because it offers quick and easy way to isolate skin parts from photo for further processing.
In most of the cases it works very well but sometimes I need to use manual estimation and apply it on different parts of the skin (for example to select light and shadow areas or if I need to select skin from group of the people with slightly different skin tones). In that case I need to repeat that process for each part and merge all skin detection layers together.
Is it possible to enhance skin detection filter to have that multiple selection option as f.e. multiple manual estimations or - similar to extract foreground filter - with green and red points as help to differentiate skin tones from background?