1. A method for digital image contrast enhancement, said method comprising: a) calculating a multi-segment, piecewise-linear luminance map for an image; b) calculating a gamma correction curve for said image; c) calculating a weighted-average luminance map by weighting values in said piecewise-linear luminance map and weighting corresponding values in said gamma correction curve to yield a final luminance map; and d) applying said final luminance map to said image.