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Chapter 24. Commercial Printing and Trap... > Preparing Artwork for Print

Preparing Artwork for Print

Related to color and the way it prints are the concepts of trapping, overprinting, and knockouts. When two colors overlap anywhere in an image, one of two things can happen. The top color can knock out the lower color, replacing it completely, or the top color can blend with the lower color to create a third color, called overprinting. When a lower color is knocked out, it is actually removed from the printing plates. The area underneath the second color is left blank. Trapping is the process of extending a color beneath or over an area where two colors meet. The extension prevents a sliver of white from showing through if the inks placed by the printing press are not exactly aligned.

Overprinting and the Attributes Palette

Overprinting is controlled for individual objects through the Attributes palette (shown in Figure 24.9). In this palette, you can choose to overprint an object’s stroke, its fill, both, or neither. In addition, you can set output resolution, you can show or hide an object’s centerpoint, and you can reverse a path that is part of a compound path. The Attributes palette is also used for assigning the target of an imagemap on the World Wide Web. (This behavior has no impact on printing.) You can add notes about a selected object by using the annotation feature of the palette. These notes are included in the PostScript file and can be used for troubleshooting.


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