Strangely worded question, not sure I understand what you are asking.
Processing as is the modern term was done in the darkroom via an enlarger using "masks" cut from cardboard or hand shapes could be used, (if not during the shoot itself) where, in B&W shots, colour was much more difficult, things could be "adjusted", skies for instance could be darkened/lightened, contrast could be changed depending on what paper grade was used. What was very difficult was removing things from the scene, old boyfriends/girlfriend for example, or making a thin person look heavier or vice versa. Hence the term "the camera never lies", to a large extent that was true back then, not now of course.
Is that what you are asking?
Matt