Method for two-dimensional, spatially resolved measurement of tristimulus values of light emitted from a plurality of positions on a matrix display, comprising the steps of: - directing a first portion of the light to an RGB camera which produces a two-dimensional map of RGB color values; - transforming the RGB color values into first tristimulus values to produce a map of tristimulus values, wherein the transformation for transforming the RGB color values into the first tristimulus values is derived once in a prior training step, in which RGB color values and tristimulus values are produced from a set of three or more different test patterns of appropriately selected colors displayed via a selected matrix display, and a 3x3 transformation matrix is found, of which the matrix components provide the best transformation results for all test patterns; - directing a second portion of the light to a colorimeter which produces second tristimulus values without spatial resolution from light emitted from a number of positions within a spot on the matrix display; - deriving a tristimulus correction by comparing the second tristimulus values with a subset of the first tristimulus values attributed to positions on the matrix display within the spot, wherein the tristimulus correction is derived by finding a diagonal 3x3 correction matrix which transforms the first tristimulus values of the subset of tristimulus values into corrected tristimulus values such that a deviation of the corrected tristimulus values from the second tristimulus values is minimized; and - applying the tristimulus correction to all first tristimulus values to produce a corrected map of tristimulus values. - directing a first portion of the light to an RGB camera which produces a two-dimensional map of RGB color values; - transforming the RGB color values into first tristimulus values to produce a map of tristimulus values, wherein the transformation for transforming the RGB color values into the first tristimulus values is derived once in a prior training step, in which RGB color values and tristimulus values are produced from a set of three or more different test patterns of appropriately selected colors displayed via a selected matrix display, and a 3x3 transformation matrix is found, of which the matrix components provide the best transformation results for all test patterns; - directing a second portion of the light to a colorimeter which produces second tristimulus values without spatial resolution from light emitted from a number of positions within a spot on the matrix display; - deriving a tristimulus correction by comparing the second tristimulus values with a subset of the first tristimulus values attributed to positions on the matrix display within the spot, wherein the tristimulus correction is derived by finding a diagonal 3x3 correction matrix which transforms the first tristimulus values of the subset of tristimulus values into corrected tristimulus values such that a deviation of the corrected tristimulus values from the second tristimulus values is minimized; and - applying the tristimulus correction to all first tristimulus values to produce a corrected map of tristimulus values.