1. A method for compensating for spatial non-uniformities in a printer, said method comprising: generating a true average tone response curve for a color channel, wherein the true average tone response curve defines an average true response for the printer across a printed output spatial range; generating a predicted average tone response curve for the color channel, wherein the predicted average tone response curve defines an average predicted response for the printer across the spatial range; generating a predicted true tone response curve for the color channel, wherein the predicted true tone response curve defines an predicted actual response for the printer for each print location in the spatial range; generating an estimated true tone response curve for the color channel using the true average tone response curve, the predicted average tone response curve, and the predicted true tone response curve, wherein the estimated true tone response curve defines an estimated actual response for the printer as a function of each print location in the spatial range and as a function of each possible digital input color level to the printer; using said estimated true tone response curve to correct a digital color level of each pixel of an image for the color channel before printing based upon said print location of each pixel of said image and based upon said digital color level of the pixel.