Patent ID: 6912306

Claim:
An image-processing apparatus for processing the image data input from an image-handling device and then outputting the image data to another image-handling device, said apparatus comprising: black adaptation correction means for correcting the image data, such that colors of the image data produced by the image-handling devices are similar, by: first converting means for converting an RGB value to a first XYZ value; second converting means for converting the first XYZ value to a first LMS value; third converting means for converting the first LMS value to a first X op Y op Z op value for use in an optical color space; first performing means for performing image editing processing on the first X op Y op Z op value to obtain a L S a S b S value; second performing means for performing image editing processing on the L S a S b S value; fourth converting means for converting the edited L S a S b S value to a second X op Y op Z op value; fifth converting means for converting the second X op Y op Z op value to a second LMS value for use in a LMS color space; sixth converting means for converting the second LMS value to a second XYZ value; and seventh converting means for converting the second XYZ value to a CMY value; wherein image data processing in the optical color space does not depend on a dynamic range of the image-handling devices.