A method of enhancing the tonal and spatial characteristics of a digital image includes receiving a source digital image wherein the source digital image is in a luminance-chrominance representation having a luminance digital image channel and at least two chrominance digital image channels; generating...http://www.google.com.au/patents/US7058234?utm_source=gb-gplus-sharePatent US7058234 - Enhancing the tonal, spatial, and color characteristics of digital images using expansive and compressive tone scale functions
