Patent ID: 7136192

Claim:
A method for calculating the color image translation accuracy of a color image translated from a source device gamut to a target device gamut comprising the steps of: converting all source image color values to intermediate color space color values and storing these converted image color values as a first set of color values; selecting a first, a second and a third color value from the stored first set of color values and storing these color values; calculating a first color contrast value between the selected first and second color values and storing the first calculated color contrast value; calculating a second color contrast value between the selected first and third color values and storing the second calculated color contrast value; employing the first and second calculated color contrast values to establish a proportional color contrast relationship between the first and second and the first and third selected color values and storing the proportional color contrast relationship; converting all target device gamut color values to intermediate color space color values and storing these converted target device gamut color values as a second set of color values; comparing the first set of stored color values to the second set of stored color values; repositioning within the intermediate color space one or more of the color values in the first set of stored image color values so that a plurality of the color values in the first set correspond to color values in the second set of stored color values and storing these repositioned color values as a third set of color values; calculating a scalar quantity indicative of the image translation accuracy using the first and third sets of stored color values and the stored proportional color contrast relationship; and converting the third set of stored color values to target gamut color values and storing these color values as a fourth set of image color values; and sending the fourth set of stored color values to the target device.