So does nobody know the technique in photoshop ?
You can do this in Photoshop, but there is no step-by-step procedure–"Click this button, type in this number, click this button" way to do it. A project like this requires a highly skilled operator/retouching artist with considerable experience.
Lightening skin is a color-correction problem; a good basic approach to doing this is to select the areas of skin, then correct them using Image->Adjust->Curves. You’ll need to pull out both magenta and cyan, take out a considerable amount of black, and add yellow (or, if working in RGB, add red and green and pull out blue)–but whenever you change both the color and luminosity of an object by a large amount it can be quite tricky to get a realistic effect. If the person’s skin is quite dark, you may find that it’s easiest to work in CMYK, and use the information in the black channel to preserve detail and texture by selectively copying parts of the black channel into the other channels and then pulling a lot of the high end out of the black.
Color correction will get the skin into the right color range, but there are other changes that need to be made as well–facial features must be changed, for example.
I once did a catalog project for an all-black church in Florida. As part of the catalog, I took a painting showing Jesus and the disciples, and did a rendering as if they were black. It’s a challenging assignment, and required well over six hours’ Photoshop time before the client signed off on it; you may have considerable difficulty with this kind of project if you’re a Photoshop novice.
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