Patent ID: 7023580

Claim:
A digital image system capable of receiving digital image data representing at least part of a digital image and mapping said digital image data onto the range of an output device, said digital image system comprising: an image statistics processor capable of calculating at least one current image statistic based on said digital image data; calculation logic connected to receive said at least one current image statistic from said image statistics processor and further being capable of calculating at least one tone curve parameter based on said at least one current image statistic and at least one perceptual preference, said perceptual preference specified with respect to said output device in order to obtain from said output device a visually perceptible behavior that corresponds to said perceptual preference; and a tone curve generator connected to receive said at least one tone curve parameter from said calculation logic and further being capable of generating a tone curve using said at least one tone curve parameter and a sigmoidal function, said tone curve being used to map said digital image data onto the range of said output device.