Patent ID: 8013867

Claim:
In an multi-primary display system, said display system including a metamer selection module, a method for determining a color value indicating a metamer color of a first color; the first color being defined by color values in at least first, second, third and fourth primary colors; the method comprising: calculating an offset quantity, the offset quantity being a function of a distance in a color space between a maximum value of the first, second and third primary color values and the fourth primary color value of the first color so that the offset quantity varies depending on the fourth primary color value of the first color; adding the offset quantity to the fourth primary color value of the first color to produce a modified fourth primary color value; and subtracting the offset quantity from the first, second and third primary color values of the first color to produce modified first, second and third primary color values; the modified first, second, third and fourth primary color values indicating the metamer color.