[Summary]: Those things about outlets: detailed explanation of the foundation of outlets
[Extended]: The shape of the dots for the detailed explanation of the dots
[Extended]: The angle of the network point of the detailed explanation of the network point
[Extended]: Screening method of network outlets in detail
In conventional printing, the dot is the basic printing unit that constitutes the printed image. The contrast between this image unit and the blank on the printed product achieves the effect of reproducing the continuous tone.
The graphic information of the printed matter and the light and shade of the color are composed of dots of different sizes superimposed on each other during the printing process to produce a variety of different hue and different brightness changes. This kind of picture and text formed by dots is called "screen" on printing. The screen was originally a kind of "screen" used in photo-engraving and a traditional screen. When using it, install the screen In front of or above the photosensitive film, it is used to divide the incident light during shooting, and to form dots of different sizes corresponding to the color density of the original on the photosensitive film. The commonly used screens were glass screens in the early days, and later developed into contact screens. Now the new electronic color separation machine or color desktop publishing system no longer needs the screen to screen.
In the amplitude modulation screening method, the photoengraving adopts traditional screen equipment to screen, and the screen separation method used by the electronic color separation machine is generally the IS (Irrational Tangent Screening) dot technology (irrational tangent dot) and RT developed by the German Hell company. (Rational Tangent Screening) dot technology (rational tangent dots). PostScript screening technology is used in the color desktop publishing system.
The dot is the most basic element in the printing process. There are always certain restrictions on the number of screens, and the level change of the image cannot be changed steplessly like a continuous tone image, so the screen image is called a halftone image.
The dot is the basis of the printing and copying process and the most basic unit that constitutes graphics. The functions of the dot are mainly as follows:
1) Responsible for coloring phase, lightness and saturation in printing effect;
2) It is the smallest unit of fat-repellent and water-repellent, and the basic element of image transmission;
3) In color synthesis, it is the organizer of image color, gradation and outline.
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