1. A method for converting an achromatic, higher-resolution image to a lower-resolution image with reduced visible errors, said method comprising the acts of: performing sub-pixel sampling on said higher-resolution image; converting said sub-pixel sampled image into an opponent color domain image; separating said opponent color domain image into separate luminance and chrominance channels; high-pass filtering said chrominance channels combining said luminance, and said high-pass filtered chrominance channels into a filtered opponent color domain image.