What is color separation? Is color separation so important? How to separate colors in Photoshop?

Answer: Color separation is a printing term. It refers to the decomposition of various colors on the manuscript into four primary colors of yellow, magenta, cyan, and black; in computer printing design or graphic design image software, color separation It is to convert the color mode of the scanned image or other source images to CMYK mode.

Generally, the scanned image is in RGB mode, and the image taken with a digital camera is also in RGB mode. Most of the pictures downloaded from the Internet are also in RGB color mode. If you want to print, it must be separated into four colors: yellow, magenta, cyan, and black. This is the requirement of printing. If the image color mode is RGB or Lab, there may be only dots on the K version when outputting, that is, the RIP interpretation only interprets the color information of the image as gray.

In Photoshop, the color separation operation is actually very simple: just change the image color mode from RGB mode or Lab mode to CMYK mode. The specific operation is to execute Image / Mode / CMYK. In this way, the color of the image is represented by the color material (ink), with 4 color channels. When outputting the film, the image will generate dots according to the color channel data, and be divided into four color separation film pieces of yellow, magenta, cyan, and black.

During color separation, when the image changes from RGB to CMYK, the naked eye can see that some colors on the screen will change significantly. What is the reason? What effect does it have on the color of the image?

Answer: When the image is changed from RGB color mode to CMYK color mode, some bright colors on some images will have obvious changes. Such changes can sometimes be clearly observed, and generally change from bright colors to darker. Some colors. This is because the color gamut of RGB is larger than the color gamut of CMYK, that is to say, some colors that can be expressed in the RGB color mode are converted to CMYK, which exceeds the range of colors that CMYK can express. These colors can only be Use similar colors instead. So these colors have produced more obvious changes. In fact, if any color in the RGB color mode image exceeds the color gamut, it can be previewed with Gamut Warning.

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