1. A method performed by an image processing apparatus, comprising: scanning a color matrix film with visible light to generate a digital color copy thereof; scanning the color matrix film with infrared light to generate an infrared alpha layer image thereof; separating a color grid of the color matrix film from an underlying silver layer of the color matrix film to produce a color grid image, wherein separating the color grid from the underlying silver layer includes computationally dividing the digital color copy of the image by the infrared alpha layer image; and using the color grid image to generate an altered version of the digital color copy, wherein using the color grid image to generate the altered version of the digital color copy includes laying the color grid image over the infrared alpha layer image to produce an apply color grid image, applying a pattern removal technique to the apply color grid image to produce a grid-pattern-reduced apply color grid image, applying the pattern removal technique to the color grid image to produce a color grid basis image, and computationally dividing the grid-pattern-reduced apply color grid image by the color grid basis image to remove adverse effect of color grid from the grid-pattern-reduced apply color grid image.