A study of the agreement between a visual assessment and the measurement of the reflectivity of printed metallic inks was performed. A psychophysical property for this percept was identified as visual brilliance. The visual judgments of a series of printed panels were compared with measurements from various types of specular reflectance instruments. The results showed that gloss does not linearly follow the appearance of highly reflective specular surfaces. It was observed that the visual assessment of brilliance was highly correlated to the normalized hemispherical diffuse reflectance factor difference. Further, visual brilliance could be mapped to a logarithmic function of the luminous specular reflectance factor and the measurement scale of log(Y) agreed with the scale of hemispherical diffuse reflectance. It was, thus, concluded that either of these measures may be utilized to establish aims and tolerances for production control of the reproduction of foil-like prints.
Due to the advancement in inkjet digital printing, it is possible to print spot color short run jobs with high quality and desired level of consistency in color at low cost. Mostly in the packaging industry, specific color is used for specific requirements of a customer, which is called a spot color. About 40 % of packaging jobs are printed by flexo, 30 % by offset lithography, 22 % by rotogravure, and 8 % by digital and other printing processes. The aim and purpose of this work was to investigate the proof color matching capability of two ink jet digital printers, differing in ink technology and prepress color matching software used, for spot color matching printed on a narrow web flexographic printing press. The results were produced by evaluating color differences between the colorimetric measurements from the flexographic printing press versus the digitally reproduced proofs from the two tested ink jet devices.
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