Patent ID: 7586640

Claim:
A signal processing unit comprising: a color transformation part for performing color transformation processing on an inputted color signal having plural components by multiplying the color signal by a transformation matrix; and an element setting part setting, every time a color signal is inputted, an element group of the transformation matrix to be used for the inputted color signal according to a hue of the inputted color signal, wherein said element setting part composes: an identification unit for identifying quadrant information indicating a quadrant to which the hue of the inputted color signal belongs and angle information indicating an angle within the quadrant of the hue; a storage unit storing in advance an optimum element group for each of a predetermined number of reference hue signals; and an interpolation unit for recognizing two pairs of optimum element groups for two of the reference hue signals close to the hue of the inputted color signal, in reference with said storage unit according to the quadrant information and the angle information, for performing interpolation computing with the two pairs of the recognized optimum element groups after performing weighting according to the angle information to the two pairs of optimum element groups, and for determining the element group to be set according to the hue of the color signal.