Questions about SSS weight map

Guys, im trying to create an SSS weight map from a diffuse. So anyone can help me with that. Basically i have to turn the diffuse map in a Black White map and paint in white/gray the area where i want to pass more light? Is that?

Thx in advance!!!:smiley:

Thx a lot for the tip, Finalbarrage, much easier than i tought!