A method and apparatus for mapping a first color space into a second color space which allows a user to specify or constrain the mapping for a subset of the points within the first color space and determine the remaining unconstrained points according to a preexisting or default mapping....http://www.google.de/patents/US6269184?utm_source=gb-gplus-sharePatent US6269184 - Method and apparatus for interactive color transformation of color values between color spaces
