Since optical filters can be made out of diffraction gratings, could a reflective filter be made by printing black dots on a sheet of white printer paper?
If so, this filter could be tuned at each pixel location using the density of black dots to reflect a desired color of light and produce a color photo.
- A highly precise printer is available.
- Very flat printer paper is available.
- The observer's gaze is directed perpendicularly into the photo.
- The observer is standing far enough away so that the photo does not appear to change color with small changes in his/her position & gaze angle.