Let me introduce to an old, forgotten process—trichromatic images.
Before color film, and before the Autochrome process, photographers would create a color image by taking three consecutive photographs through three color filters, one red, one green, and one blue.
The three black and white image could then be projected on one another back through their respective color filters to create the illusion of a color image.
The process is quite simple:
With a tripod, take an three images of your subject. One with a red filter, one with a green filter, and one with a blue filter. Don’t layer the filters, rather take an image with a filter, then replace that filter with the next color.
Process your film as you normally do.
Import your images into photoshop.
Using the channel mixer, add each color to its respective channel.
Viola! You should see a color image.
You’ll notice from my example above that anything in your scene that moves will only adopt the color of the filter, or filters where the subject was still. While some feel like this is a drawback of the process, I feel like it a wonderful effect that be used artistically for various effects.
Another trichrome image where the subject, my dog, moved between shots.