Dreaming of a darkroom is the sign of growth gone undetected. A darkroom is where pictures from older cameras are developed. Thus, as the name implies, it is a very dimly lit room, having little light in it as to let the film develop correctly. Dreaming of the dark room has the same meaning; there is potential growth and development that unfortunately are kept in the dark. They are hard to notice as it happens, but the end result is superb.