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Tell me about overprinting

 

General information on overprinting

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.

 

Color Overprint

The Color Overprint function is only effective if the overprint color or graphical object has been specified accordingly in the DTP application.

Caution: In some older DTP applications, e.g. QuarkXPress™ 3.x, the overprint information is not included in the generated PostScript® file. As a result, overprinting may be skipped.

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Black Overprint

To print black areas (e.g. text on graphics) over the other colors, check the Black Overprint option and specify the percentage threshold as of which black overprint should be active.

All black objects will be printed with this overprint function, irrespective of what is set in the DTP application.

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