A method of enhancing a digital image comprising: providing a digital
image; decomposing the provided digital image into a multi-frequency band
representation including a low frequency band image and multiple
different high frequency band images; multiplying each of the
high-frequency band images with a gain factor; summing together the
unmodified low frequency band image and the modified high-frequency band
images to produce a reconstructed digital image; and mapping the
reconstructed digital image through a tone-scale look-up-table to map the
reconstructed digital image to optical densities.