Adobe's Photoshop color management system As Adobe's most famous image processing software, Photoshop has an irreplaceable position in image processing. At the same time, Adobe is working hard to develop Photoshop into a complete color management system. The color management features of Photoshop software are controlled by Monitor Setup, Printing Inks Setup, and color separation settings.
In order for the user to see the color on the screen as close as possible to the color of the output sample, the user's system must first be calibrated. The exact color workflow must begin with the display calibration and display settings. “Monitor Setup†includes two parts: display calibration and display settings. In the display, the correct selection is made by the display type, phosphor powder, color temperature, etc., so that when the image is converted into the color mode, the correct color conversion can be performed according to the setting of the above parameters.
The basic purpose of the printing ink setup is that Photoshop provides information on the ink, paper, and printing machinery used for the final printing. Different papers have different ink absorption and dot gain. Different inks have different color rendering properties, and different printing methods have different dot enlargement rates. So you need to set these parameters in the "Printing Inks Setup". After the basic information is obtained from the RGB image data and the display data obtained in "Monitor Setup", the color mode conversion can be completed according to the characteristics of the final printing conditions.
The most important item in color separation is the determination of the amount of black plate. In theory, multiple CMYK values ​​can be generated from an RGB value separation, and the final print effect should be the same. However, due to the amount of ink received by different printing papers and the characteristics of different printing machines, the theoretical possibility may not be realized, so it is necessary to set the type of color separation and the amount of black plate and the percentage of total printing dots.
Apple's ColorSync color management system ColorSync is a color management system released by Apple. It uses ICC standard and Lab color space as the standard reference space. It is a system-level color management software applied under the Mac operating system. It is an open color management system that allows users to color convert between different color management systems via ColorSync's Plug-in module. The ColorSync system consists of three components, an ICC standard color profile, color matching (CMM) and application software interface (API).
The device description file defines the color characteristics of the device, which allows you to obtain a range of colors that the device you are using can display, capture, and reproduce. When you create a file with ColorSync, a profile file is stored in the file so that when you process an image with a ColorSync profile on another device, ColorSync compares the device characteristics of the image with the characteristics of the display. Color space matching operation for the best color effect.
The color matching method is the core part of ColorSync, which realizes the conversion of different color spaces. More importantly, ColorSync's color conversion mode uses Linotype Hell's high-quality color matching technology, allowing users to use a better color gamut compression method to process colors outside the color gamut.
Since the performance of various applications varies from color to image, the same image color will have a different appearance from image scanning to final copying. In order to be able to master accurate colors at work, it is necessary to perform effective color matching of these applications. Color matching can be done with ColorSync's application software for consistent purposes.
Kodak's color management system, Kodak, is a color management system that supports both PC and Mac platforms. Unlike Apple ColorSync and Adobe's Photoshop, Kodak's color management system tends to use a modular approach to color management, and provides several localized modules that can be combined to form a complete color management system. . And it has color management capabilities for the Photo CD image input process.
The Kodak color management system generally includes four modules, KPCMS, DCP, PICC and PCS100, which can be used separately or combined into a complete color management system.
The KPCMS module (Kodak Precision Color Management System) provides enough device description files in accordance with the ICC standard format. Its input devices include RGB image sources and CMYK image sources, and its output devices include printers and proofers. However, since it cannot edit the device description file itself, it has great limitations.
The DCP Module (Device Color Description File Starter Package) is a software package that provides display and output color correction for PhotoCD images. When opening a PhotoCD image, the user is asked to select two device description files. The input device description file is a Photo CD device. The description file, the output device description file can be either a display description file or a color proofer description file. The PICC module (Precision Input Color Characterization) provides a practical standard program for the scanner and enhances the functionality of the DCP.
For advanced image processing and scanning applications, Kodak offers the PCS100 module to accelerate the color conversion process for Photo CD and Prophoto CD images. With the PCS100 module, direct links between various devices can be generated to skip the intermediate conversion process to the CIE color space, saving time per conversion and color loss during conversion.
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