Color printing

- Oct 22, 2019-

The color separation process is used to digitally scan an original and divide the original into red, green, and blue components. Prior to the development of digital imaging, the traditional method of color separation was to take images three times, each time filtering different light with a color filter of the corresponding color. However, after color separation, the desired result is three gray images representing the red, green, and blue components of the original.

The next step is to convert each color separation. When a negative image of a red component is generated, the generated image represents the component of the image cyan. Similarly, a negative image of the green component and the blue component is generated to generate magenta and yellow color separation patches accordingly.


Printing inks cannot be mixed. For this reason, only one color of ink can be printed at a certain position on the paper at a time. The visual blend produced by the different colors printed together gives the viewer the concept of continuously adjusting the image. To separate the colors from each other, you can use a screen to achieve this, and the resulting dots are also called halftones or halftones.

Traditional halftone screens are made of two glass sheets, each of which has ink-filled lines that are bonded vertically. Each of the color separation sheets is produced by exposure of these screens. High contrast images, once developed, form dots of different diameters based on the amount of light received in the area, which produces a gray color separation image.

The glass screen is gradually eliminated after the appearance of high-contrast films. The high-contrast film is a halftone network by using a color separation film. It is then replaced by a process in which electrons are directly laser-generated to create a halftone on the film. Currently, computer-to-plate (CTP) technology allows printers to completely eliminate the film portion of the process. The computer-to-plate technology directly images the dots on the plate with lasers, saving costs, improving quality (because of reducing duplicate replication), reducing production time, and reducing the environmental hazards of toxic film processing chemicals.

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Edit by Height Musical Instrument News Department