Patent ID: 7394540

Claim:
A method for measuring a light source with an imaging photometer, the light source including a first area having a first spectral power distribution and a second area having a second spectral power distribution different than the first spectral power distribution, the method comprising: determining standard chromaticity coordinates and luminance scalings for the first area and the second area of the light source; selecting one or more data points in the first area and the second area for measurement; calculating a first calibration for the first area and a second calibration for the second area using the standard chromaticity coordinates and luminance scalings; applying the first calibration to the selected data points in the first area such that a desired colorimetric result is displayed for each data point in a single colorimetric measurement of the first area; and applying the second calibration to the selected data points in the second area such that a desired colorimetric result is displayed for each data point in a single colorimetric measurement of the first area and second area.