1. A method of enhancing a digital image comprising: decomposing the digital image into a multi-frequency band representation of four frequency bands as follows: (a) a lowest frequency band image which represents large-sized features in the digital image; (b) a low-to-mid frequency band image which represents mid-sized features in the digital image; (c) a mid-to-high frequency band image which represents the small-sized features in the digital image; and (d) a highest frequency band which represents very fine detail in the digital image; manipulating the mid-to-high frequency band image to produce a sharpness or blurring effect of the small-sized features of the digital image; multiplying at least one 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.