Patent ID: 7755762

Claim:
Method of improving a color filter comprising the following steps: /1/ determining colorimetric coordinates of an initial color filter; /2/ numerically generating a first set of transmission spectra, each of the spectra of said first set having variations which correspond to one sinusoid or to an average of several sinusoids over a visible light interval; /3/ for each spectrum of the first set, calculating colorimetric coordinates of said spectrum; /4/ within the first set of numerically generated spectra, selecting a second set of spectra having colorimetric coordinates which correspond substantially to the coordinates of the initial color filter; /5/ for each spectrum of the second set, using a digital computer for quantitatively evaluating a dummy filter corresponding to said spectrum, a result of said evaluation characterizing a capacity of said dummy filter to restore at least one hue and being obtained by using a numerical model of color appearance to simulate a visual perception of a sample of the hue through said dummy filter; and within the second set of spectra, selecting one of the spectra which exhibits the best quantitative evaluation to constitute an improvement of the initial filter.