A method for correcting color shifting produced by improper imaging, in a digital signal representation of a natural scene image including the steps of: determining the white point of an image; determining the black point in an image; calculating a color correction for the image as a function of the...http://www.google.com.au/patents/US5371615?utm_source=gb-gplus-sharePatent US5371615 - Image-dependent color correction using black point and white point in a natural scene pictorial image
