In general, spot colors are printed in the field, and dot processing is rarely done, so the angle of spot color screening is rarely mentioned. However, when using a light-colored screen with color registration, there will be problems with the design and modification of the screen angle of the spot color dots. If there is a spot color with dots and the color printed by other dots has an overprint area, the angle of the spot color screen must be considered.
At this time, if the screen angle between the spot color dots and the screen angles of other colors is less than 30 degrees, there will be moire caused by the screen hit; if the angles overlap, it will cause ink overprinting problems, which will cause printed products Severely distorted colors.
In addition, the screen angle of the spot color is generally preset to 45 degrees in the software (45 degrees are considered to be the most comfortable angles for human eyes, so that the dots can be arranged at the same angle as the horizontal and vertical lines can be reduced The ability of the human eye to detect dots), if it is a two-tone image or a data file that has been printed outside of four-color black (generally in four-color screen printing, the black dots are placed at 45 degrees, yellow is 0 degrees (Magenta is 15 degrees, cyan is 75 degrees)) If there are spot colors, or there are more than two spot colors, they will be output at 45 degrees during color separation and screening, so when using a light screen for spot colors, if It may be overprinted with other screen colors, you must open the dialog box of software color settings or print settings during color separation output, and modify the screen angle of spot colors.
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