Here is my attempt at this.
Ever carved/wiped and image on a fogged bathroom mirror or a car window with condensation? Same kind of principle but backwards.
When you take a picture with a camera with file. Light enters the lens and carves “clear” spaces on the film. Where there isn’t light (i.e. an object/person) there is no light so the film (fog) stays creating dark areas. When the film is processed the light areas (no objects) are washed away. Only leaving the dark areas (objects).
This is just black and white images. How you get color is to separate black and white into Red, Green and Blue. But the principle is the same, you just have three colors instead of two. This creates the effect of full color to us.
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