Prepress procedure of exclusive four-color reproduction with enhanced gamut for rotogravure and special inks, color chart and software used

摘要

This procedure consists in a first stage of reception of the information given by a client and its technical analysis. It also consists in a second stage of preparation of photochromes and flat colors on the basis of the “Pantone” scale and the CMYK part of the original file. It consists in a third stage of transfer from the “Pantone” scale to an own scale and obtaining the flat colors with this scale. It consists in a fourth stage of reproduction and correction of the color and of the tone scale up to a 97% of approximation, and a fifth stage of calibration by software and manual retouching of these colors and the tone scale up to a 99% of approximation. Finally, this procedure consists in a sixth stage of preparation of the engraving final images in the printing cylinder and storage in an adequate medium. The third stage includes three steps. The first one is the selection of those colors that are nearer to the original. The second step is the application of the secondary curves to achieve the tone compensation and obtain the halftones of the spot colors and turn them into CMYK colors. The last step is the application of the tertiary curves to achieve suitable gradient cuts. In the fourth and fifth stages, the achieved tone and color value arises from considering the ICC output profiles and the ICC input profiles with a suitable calibration for color tests. The ICC output profile will be the one of the enhanced gamut inks which are used, while the ICC input profile will be, preferably, a standardized profile.