New Evaluation Method for the “Appearence” of Black and Color, in the Glossy Prints in the Observation Environment

Abstract

In glossy photographic printing, black density and color reproducibility are an important image quality to evaluate. For quantification method for color, lightness (CIEL^*a^*b^*) and optical density (OD) based on spectral reflectance measurement method (45 degree illumination by ring-shaped light source, 0 degree viewing) had been used. However, there often be a case that the measured L^*a^*b^* and result from subjective evaluation does not match depending on observed ambient lights. Therefore we examined new evaluation method, which has high correlation to the subjective evaluation. And we used the new evaluation method to develop the new “imagePROGRAF PRO” series printers, and realized high black density and good color.