1. Direct color separation and screening
The direct color separation and screening is to screen at the same time as the original color separation, so that the color separation and screening are completed in one photograph, and the result is a color separation and screen negative picture. For direct color separation and screening, first put the color negative film and the mask on the original of the camera. Then overlap the gray contact screen and the full-color special hard-adjustable film, install it on the photosensitive plate holder, and then put the color filter It is installed on the light source and performs color separation and screening at the same time. Reflective originals can also be used. This method has the characteristics of simplified process, improved quality, easy to master, small loss of fine layers, solid contour, strong texture and good braking. It also has the advantages of fast plate-making speed, convenient operation and saving of raw materials.
Equipment for direct color separation and screening can use plate-making cameras, color separation magnifiers, and electronic color separation machines that generally have direct screening functions.
2. Indirect color separation and screening
Indirect color separation screening is to use the trimmed continuous color separation negative film as the subject, place it on the original frame, turn on the light source, the light passes through the transparent part of the color separation negative film, and is irradiated by the lens to be placed in front of the photosensitive film On the screen, through the role of the screen, the various parts of the color separation film with different shades and different gradations are divided on the photosensitive film into dots of different sizes to be photosensitive, and then made by development, fixing, and washing The color-separated picture with dots.
Indirect color separation and screening are usually carried out on the plate-making camera, and the screen can be enlarged or reduced. The screen used is generally a glass screen, and the number of lines of the screen should be based on the type of draft, the type of printing machine, and the ink. , Paper and plate-making methods to determine.
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