Preparation and reproduction of filters and preparation of filter photographic materials

A process for making a color filter, comprising:

• locating a first photographic material and a mask having a given pattern at a first predetermined distance in opposite relation;
• illuminating said first photographic material and said mask three times with red, green and blue beams from opposite directions at sequentially different mask positions, causing interference with the illumination light from said first photographic material as reference light and with the light transmitting the mask as object light;
• making a hologram by recording an interference fringe with each of red light, green light and blue light, caused by illuminating said first photographic material in said illuminating step, on said first photographic material;
• locating the hologram in opposition to a second photographic material at a second predetermined distance therefrom so that said first predetermined distance from said hologram is a distance which overlaps with said second photographic material;
• and
• illuminating said hologram with illumination through the second photographic material and recording in said second photographic material an interference fringe defined by light defracted by said hologram and said illumination light.

A process for reproducing a color hologram, comprising:

• locating a master hologram of Lippman type, having recorded red, green and blue information in opposition to a photographic material at a distance the size of the red, green and blue information recording pattern;
• and
• illuminating said master hologram with light obtained by mixing of three colors red, green and blue from a direction of said photographic material, causing interference between light defracted from said master hologram and the mixed red, green and blue light and recording in said photographic material an interference fringe,
• whereby red, green and blue information of the master hologram is transferred and reproduced on said photographic material.