Development of information model of color reproduction process in polygraphic systems

Abstract

Color calibration is a common procedure in polygraphic reproduction, and there are enough tools to guarantee accurate digital or analog reproduction (printing on paper, screen or display projectors, etc.). The topical task is to achieve the correspondence of colors formed on different devices of the printing process. The color on the monitor screen must match the color on the printer print. In addition, if there are several monitors and printers at the enterprise, it is necessary to ensure color matching between them. The aim of the article is to develop a model of step-by-step conversion of color images in order to achieve high quality reproduction in reproduction systems. The methods of automatic algorithmic conversion (using Convert to Profile in Adobe Photoshop) and conversion by the color separation operator were used in the work. Conversion of the image from the LAB color space to the CMYK color space was carried out using various conversion methods: Relative Colorimetric, Absolute Colorimetric, Perceptual, Saturation. This sequence of actions allowed to identify the nature and level of change of color coordinates. The maximum saturation reduction is observed when using the Relative Colorimetric and Absolute Colorimetric conversion algorithms. The minimal one – when using Saturation and Perceptual algorithms. Thus, the use of different conversion algorithms to varying degrees affects the saturation of different colors. The practical significance of the study is that the information model has been developed which will make it possible to implement the technology of priority color reproduction, depending on the purpose of the reproduction process, which increases the accuracy of the conversion of color information of the originals and, accordingly, the quality of production of printed publications