1. A method for determining a color calibration for different spectral light inputs in an imaging apparatus measurement, the method comprising: creating a reference color calibration and a reference luminance scaling calibration for each of a plurality of colors; measuring a reference gray value R, G, B for each color in an image measurement of the light source; calculating an R, G, B gray value for a first pixel in each of three filtered image measurements; calculating pixel ratio values from each of the three first pixel gray values; comparing the reference gray values to the pixel ratio values to determine which one or more reference gray values are most similar to the pixel ratio values; calculating X, Y, Z values for the first pixel in the image measurement; and repeating the calculating an R, G, B gray value, calculating pixel ratio values, comparing the reference gray values, and calculating X, Y, Z values steps for each subsequent pixel in the image measurement.