What is the trapping value based on? Where is the difference between Choke and Spread? What does Keep away mean?
(1) Trap control is performed at the interface where two colors are transferred. The shrinkage or expansion of its foreground (or background), hollowing out, or emptying are all called trapping values. In order to avoid glazing at the overlap, the trapping value should be slightly larger than the four-color registration accuracy of the printing press. Due to the different printing processes used in various color prints, as well as the precision of paper and printing machinery, the more precise the printed matter, the higher the precision of registration and the lower the trapping value. The United States Printing Service and printing plants have published typical trapping values. For example: sheetfed offset printing, the use of copperplate paper dot line number is 150lpi, the trapping value is 0.08mm; newsprint web offset, the number of lines is 100lpi, the trapping value is 0.15mm.
(2) Shrinkage is the increase in the area of ​​the (light-colored) background so that it will intrude into the darker foreground (text or figure) at the boundary, while maintaining the shape of the foreground contour unchanged. The expansion is to increase the foreground area of ​​the lighter color, so that it will invade the background area with a darker color on the boundary, while maintaining the shape of the background outline.
(3) Let empty when the background is black, and the foreground is hollowed out, the three shades of CMY need to be dealt with when empty, so that the foreground contour is defined by the monochrome black version.
(1) Trap control is performed at the interface where two colors are transferred. The shrinkage or expansion of its foreground (or background), hollowing out, or emptying are all called trapping values. In order to avoid glazing at the overlap, the trapping value should be slightly larger than the four-color registration accuracy of the printing press. Due to the different printing processes used in various color prints, as well as the precision of paper and printing machinery, the more precise the printed matter, the higher the precision of registration and the lower the trapping value. The United States Printing Service and printing plants have published typical trapping values. For example: sheetfed offset printing, the use of copperplate paper dot line number is 150lpi, the trapping value is 0.08mm; newsprint web offset, the number of lines is 100lpi, the trapping value is 0.15mm.
(2) Shrinkage is the increase in the area of ​​the (light-colored) background so that it will intrude into the darker foreground (text or figure) at the boundary, while maintaining the shape of the foreground contour unchanged. The expansion is to increase the foreground area of ​​the lighter color, so that it will invade the background area with a darker color on the boundary, while maintaining the shape of the background outline.
(3) Let empty when the background is black, and the foreground is hollowed out, the three shades of CMY need to be dealt with when empty, so that the foreground contour is defined by the monochrome black version.
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