The first section continuously adjusts the principle of image tone reproduction
The light and dark levels (tones) of successively adjusted images can be expressed in two ways on printed matter. One is to use the thickness of the ink layer, such as gravure printing. One is the use of dot coverage, such as letterpress, lithography, stencil printing, etc.
First, the transfer of image tone
(A) in Figure 3-1 is a continuous negative-motion negative film taken with a plate-making camera, which is used to produce a PS plate (flat plate). After printing, the figure (B) in Figure 3-1 is obtained. The dark and light levels on the film were all lost, only black and white, this PS version and the middle of the degree film corresponding to the photosensitive layer, in the print, not enough light to produce a photochemical reaction, was washed away when developing The resulting foundation of the image was destroyed.
Figure 3-1 Transmission of Mesh Tones
In order to reproduce the light and dark levels of the image on the original, it is necessary to create a positive or negative negative of the screen. The image is divided into many discrete dots, then transferred to the printing plate, and then printed. In the unit on the sheet, the total area of ​​the dots is large, the ink coverage is high, the reflected light is small, the absorption of light is more, making people feel dark; within the unit area of ​​the printed sheet, the total area of ​​the dots is small, the ink coverage is low, and the reflected light More, it absorbs less light and gives people a bright feeling, so that the shades of the original image can be reproduced on the printed sheet.
In the original version, the Chinese network technology formed is called an outlet. In the printing of letterpress, lithography, stencil, etc., dots are the basic printing units that constitute continuous tone images. Through image processing, this image unit is compared with the blank on the print to achieve the effect of reproducing the continuous tone.
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