A simple method for adjusting pseudocolor distributions of
photographic images is described and demonstrated experimentally.
This method is based on the technique for photographic phase image
pseudocolor modulated by a grating. A reflecting ray path is introduced
into a 4f system to produce diffraction of the dual-phase grating so that
the pseudocolor at the output plane can be adjusted. The merit of this
method is that many pseudocolor images with different color distributions
can be obtained for each diffraction order.