1. A method for digitally enhancing an initial image of a material to which a plurality of stains were previously applied, comprising the steps of: unmixing the initial image into a plurality of individual reconstructed images, each individual image corresponding to one of the stains; estimating a residual image corresponding to a difference between the initial image and the unmixed reconstructed images; adjusting one or more components of the individual reconstructed images; mixing the adjusted components; and adding the residual image to the mixed adjusted components to generate an enhanced image.