Patent ID: 6501850
Filing Date: 2002-12-31
Classification: G06K,H04N

Abstract:
A method for including photographic calibration from a photographic process into digital color management having an abstract color transformation profile operative in a profile connection space, the method comprising the steps of:(a) measuring density values from one or more density patches on a test image produced by the photographic process and which represents an optical process aim, thereby providing measured density data; (b) providing a transform for transforming between density data and colorimetry data based on spectrophotometric data of a particular paper representative of typical dye sets used in the photographic process, wherein the transform is operative in a CIE psychometric lightness space; (c) providing a 3-dimensional table having table values for uniformly sampling the profile connection space; (d) converting the table values into a lightness function; (e) transforming the table values into a density function using said transform provided in step (b); (f) finding table values corresponding to physically realizable colors; (g) adjusting the table values corresponding to physically realizable colors to the optical process aim by 1-D interpolation from a digital process aim using the measured density values from step (a); (h) transforming the adjusted table values back to colorimetric values by using an inverse of said transform provided in step (b); (i) transforming the colorimetric values to the profile connection space by using a relationship inverse to that used in step (d); and (j) saving the transformed colorimetric values as an abstract color transformation profile.