This paper presents a new optical method for density pseudo-coloring that the solor can be adhusted The method is based on the technique of phase image pseudo-coloring and ealizes adjustable pseudo-coloring by using the diffract effect of dual gratings and filtering technique in whitelight system. The paper proves the principle and verifies the validity of the theory by experiment. Certain images are processed. Both the theory and the experiment show that this method is effective.