A photo studio or darkroom is where an image is set up, lit and slowly developed. Dream books read it as self-image under construction, and as something becoming visible a little at a time.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.