When objects lying on top of each other (images, text, graphics) are printed, the objects in the background will be knocked out. This prevents alterations to the color as a result of intermixing foreground and background colors.
In practice, however, register errors can cause shifts and thus gaps (so-called flashes) between the color areas. When a specific printing ink is overprinted, the areas below will not be knocked out so that flashes are avoided. As a rule, black text (especially text in a small font size) should always be overprinted.
Note: You cannot select the overprint functions if the option for CMYK-JPEG-EPS® is enabled.
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