(hopefully I posted this in the right place) I am currently exploring the idea of creating a filter, with photographic application, that would allow for black and white images to be created without the use of black and white film. I am basically wondering if this is in fact a possibility, using a combination of colored filters (possibly red, green, and blue?) to make a single one. If it is in fact possible, and attainable, it would have numerous applications, from eye glasses to viewfinding filters for cameras. If anyone can steer me in the right direction, I would appreciate it. I only have one year of physics (adv. high school physics) under my belt, so I'm not exactly "in touch" with some of the terminology. Any help here would be sincerely appreciated!!