1. A method for converting color images to textured monochrome images such that regions with similar luminance but different chrominance appear different when converted to black-and-white, comprising: a) converting the color image to a luminance-chrominance color space; b) performing a wavelet transformation of the luminance channel; c) replacing a predetermined number of sub-bands by scaled versions of the chrominance channels; and d) inverting the transformation to generate artificial textures proportional to the original colors of the color image.