Color image sensor module and color mask used by the color image sensor module

The present invention provides a color image sensor module and the color mask used by the color image sensor module. The color image sensor module includes the color mask, a monochromic image sensor, and a cylindrical lens. The color mask comprises a light guide plate, an LED module set on one side of the light guide plate, and a convex lens which refracts light to the surroundings. The light emitted by the LED module is refracted by the convex lens and scattered in a fan shape, illuminating a positive/negative film, at least covering the width of the positive/negative film. The scattered light further passes through the cylindrical lens and then focuses on the monochromatic image sensor, which transforms the light signal generated from sensing the brightness of the light into an electric signal.