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Effects of spectral range and resolution on colorimetric evaluation of proofing systems

This paper is concerned with the effect of spectral range and resolution on spectral colorimetric measurements in graphic arts. The Committee for Graphic Arts Technologies Standards (CGATS.5) specifies CIE measurement conditions for graphic art color. The data shall be measured from at least 400 nm to at least 700 nm at not greater than 20 nm intervals. The reference for spectral data shall be based on computed data at 10 nm intervals. Values, representing the product of CIE illuminant D50 and 2 degree standard observer data, to be used for weighting spectral reflectance data shall be those given in the tables for 10 nm and 20 nm from ASTM E303. These values are based on triangular bandpass characteristics with 10 respectively 20 nm bandwidth at the half power point. The weighted values must be adapted if the measured spectral data begin at a wavelength greater than 360 nm or the last measured spectral data are at a wavelength less than 780 nm. Instrumentation with different spectral ranges and different intervals will produce different results. This paper compares these different results for some printing and proofing systems.