Why color management

The definition of color management (a) through scientific and digital methods (b) calibration and stability of various devices (c) record the device's color characteristics in the "profile"
(4) Get predictable colors (5) Benefits of reproducing colors in different environments. (1) Predicting color changes. (2) Reducing the blind spots of color communication. (3) Reducing unnecessary production loss. (D) Speed ​​up the use of digital proofing and reduce costs (5) Simulate the development of different printing features Color management (1) Transparent for the user (2) Built-in input and output devices (3) Development of digital photography and images (D) Computer Direct Plate Making (V) The Digital Printing Year (Six) Digital Draw Digital Color Theory We use a set of four-color designations such as 20C, 20M, and 30Y to be displayed or output on different devices. The visual colors to be obtained are inconsistent because the materials and colors used in each device are different. For example, fluorescent screens are fluorescent substances and RGB colors, but printing is ink pigments and CMYK colors. This is not possible, but we also want to make the two approaches as close as possible. This work is called color management (Color Management). To understand what color management is, you must know some basic terms such as Color Gamut, Color Space, Color Conversion, and Device Profile.
Color Model or Color Space
Each device, scanner, and screen that print color has its own way of expressing color. This is the color space, which can also be called the color mode. For example, the screen description color is RGB, and the R250+G20+B30 represents some degree of red on the screen. Printing uses CMYK inks to mix different colors. For example, 100M+100Y means red. The above RGB and CMYK are different color spaces.
RGB color mode The color screen synthesizes red, green, and blue in different proportions to produce millions of color changes. Each of the graphic elements, or the red, green, and blue components in the pixel, is captured in the image. Give a value, usually an integer from 0 to 255. Adding three primary colors with the same value produces pure white, which is why the RGB mode is called additive color mode.
In addition to the color screen, the RGB mode is the core of all color scanners. The principle of the color scanner is to record the intensity of light reflected from the scanned image at each pixel or when scanning a slide or a transparent document. Through luminosity. The scanner's photoreceptor is placed behind a set of red, green, and blue filters to detect the red, green, and blue components of the pixel.
Although the RGB mode is of great significance to color scanners, screens, and films, the combination of red, green, and blue inks printed on paper can only generate a very limited range of color gamuts, so color printing or printers use RGB. Complementary CMY to replace.
CMY color mode Cyan, magenta, and yellow (CMY) modes are complementary to the RGB mode. It is a Subtractive Color Model, which is contrary to the additive principle of the RGB mode. A small number of color printers use the CMY color model.
CMYK color mode In theory, the synthesis of the same proportion of magenta, cyan, and yellow will produce pure black or gray, but in fact, things are not exactly like this. The problem is that the inks are all imperfect pigments, and they are always miscible with other colors. Therefore, the synthesis of equal amounts of magenta, cyan, and yellow in the field will produce a deep mud brown. Therefore, to produce black color, it is necessary to use black ink, which results in the CMYK color mode. Black is represented by the letter K, not B, to avoid confusion with blue, and also because the black component is often the key to color separation.
CMYK is one of the most important color modes because it is the basis of almost all color printing processes. In the printing process, the synthesis of four primary colors and different proportions produces tens of thousands of colors, which can meet the needs of copying color photographs.
Another major advantage of using four primary colors compared to the three primary colors is the clearerness of printing black characters, both on the press and on desktop printers. Do not use magenta, cyan, and yellow combinations to generate black characters, but it is better to print black characters directly from black ink. Other advantages include better contrast in photographic prints, sharper details in the darker parts of the image, and the ability to use black prints instead of expensive color inks.
The principle of color management Prior to desktop printing, color management was not a big problem because high-end system manufacturers had already calibrated their hardware and software in the factory using a color look-up table (Color Look- Up Tables) compensates for the characteristics of each input, output, and output device. The reason why high-end prepress system manufacturers can use the color chart to calibrate is because all parts of the system are produced and assembled by them.
Most publishers now use open systems made up of devices from different manufacturers, so color management requires more attention and greater coordination. Device-independent coloring is an important starting point for establishing connections between devices. This helps ensure optimal color consistency. This is what the color management system does; it ensures that the colors are between devices, such as scanners, screens, Match between the color printer and the printer as accurately as possible. Therefore, a color management system should be established around the "non-device dependent" color model.