Patent ID: 6888964
Filing Date: 2005-05-03
Classification: H04N

Abstract:
1. A method for automatic reproduction of colors of an original scene from an original image, which comprises: presenting the original image as one of an electronically scanned color negative and an electronically scanned diapositive film having image points; storing RGB color values of image points as one of the group consisting of scanned transmissions and scanned densities; determining, in an RGB color space, a gray straight line optimally approximating a principal axis of a cloud of points formed by scanned densities of the image points; determining corrected transmissions to which corrected densities correspond by respectively subtracting minimum transmission values from the scanned transmissions; determining reconstructed film exposures utilizing the corrected transmissions, whereby, film exposure straight lines are constructed with the gray straight line, the film exposure straight lines describing a relationship between logarithmic film exposures and the corrected densities; and projecting the reconstructed film exposures onto an image range between a normalized highlight fixed point and a normalized shadow fixed point, and determining normalized film exposures.