Evaluation of Bispectral Spectrophotometry for Accurate Colorimetry of Printing Materials

However, when dealing with hardcopy materials (paper and inks) that contain fluorescent components, the color measurements become questionable. Conventional spectrophotometers measure total radiance factors of fluorescent materials for the light source within the instrument. Such measurements cannot be used to obtain accurate colorimetry for other illuminants or sources. On the other hand using bispectral methods, which measure reflected and fluorescent spectral radiance factors as a function of incident wavelength, produces illuminant independent data and thus more accurate colorimetric calculations.