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Overprinting: refers to the need for overlapping registration in the printing of multi-color patterns when printing in multiple colors; trapping: refers to the overlapping of a color block with another color block to avoid white edges during printing, so it is also called supplemental whitening ; The place where the two colors are transferred may be offset in printing when not trapped, resulting in white edges or color aliasing. Trapping is where the two colors that are transferred penetrate each other at the place where they are transferred, No white edges are produced. Spot color refers to the fact that instead of printing the four colors C, M, Y, and K, this color is printed, but a specific ink is used to print the color.
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