We will describe a technique of white light optical information processing with diffraction grating method and some of their applications. This white light technique enables the signal processing to be carried out in complex amplitude rather than in intensity. The basic advantage of this white light processing technique is the elimination of the coherent artifact noise that frequently plagues the coherent optical system. We note that this white light processing technique is capable of processing many complex signals that a coherent prooessor may offer. The applioation may range from complex signals that a coherent prooessor may offer. The application may range from complex signal addition, subtraction, to complicated optical parallel processing. Because of the use of spectral broadband light source, this technique is very suitabla for color-image processing, enhancement, and restoration. Experimental demonstrations of this white-light processing technique as applied to archival storage of color films, multi-image rageneration, spatial frequermy and density pseudocolor encoding, smeared image restoration, etc. will be included.