Method for matching colors between two systems
A method for matching colors including comparing the appearance of a first white color associated with a first color imaging system and a second white color associated with a second color imaging system, wherein the tristimulus values of the first and second white color are similar; determining a fixed correction to the tristimulus values of the second white color to achieve a visual match to the first white color; measuring a first set of spectral values for a first color associated with the first color imaging system; determining a first set of tristimulus values from the first set of spectral values; measuring a second set of spectral values for a second color associated with the second color imaging system; determining a second set of tristimulus values from the second set of spectral values; applying a correction to the tristimulus values of the second color; determining a difference between the tristimulus value of the first color and the corrected tristimulus value of the second color; and adjusting the second color to reduce the difference.
1. A method for creating a standard definition for a color comprising:
providing a source of a color;
measuring a set of spectral values for the color stimuli associated with the color with a spectral measurement device controlled by a digital processing system;
defining a first set of human observer color matching functions defined by matching saturated colors;
calculating a first set of tristimulus values from the spectral values and from the first set of human observer color matching functions;
calculating the approximate magnitude of saturation of said color from said first set of tristimulous values;
defining a second set of human observer color matching functions defined by matching whites;
defining a third set of human observer color matching functions defined by performing a weighted combination of the first and second set of color matching functions, wherein the magnitude of the weighting factor for the first set of human observer functions increases with the magnitude of said estimated saturation and the weighting factor of the second set of human observer functions decreases with the magnitude of said estimated saturation;
calculating a second set of tristimulus values from the spectral values and from the third set of human observer color matching functions;
transferring the second set of tristimulous values to a destination device, wherein the destination device displays, stores, or otherwise communicates the tristimulous values in order to define the color.