Prepress settings

You can specify information for prepress production workflows by setting the ArtBox, BleedBox, and TrimBox elements. These elements correspond to the /ArtBox, /BleedBox, and /TrimBox entries in the page dictionary of a PDF file. (See section 10.10.1 in the PDF Reference for details.)

Unlike PDF, these elements do not specify the exact coordinates of the boxes but rather their offsets (margins) from the edge of the visible page, where the page size is specified by the PageSize element (see Page size and rotation).

These elements all have the same attributes:

•	left, top, right, and bottom specify the distance from the edge of the page to the corresponding edge of the box. Their default values are 0pt, meaning that the size of each box is the same as the page size. (See Specifying length for details.)

•	alternation specifies whether the settings should apply to all pages in the current scope, odd pages, or even pages (see Odd and even pages).

This example shows the art box being set differently for odd and even pages. All offsets are set to 36 points (.5 inch) from the edge of the page, with the exception of a 72 point (1 inch) offset for the left side of the art box on odd pages and the right side for even pages.

Example: Setting the art box for alternating pages

<PDF result="doc2">

	<PDF source="doc1">

		<ArtBox left="72pt" top="36pt" right="36pt" bottom="36pt" 

				alternation="OddPages"/>

		<ArtBox left="36pt" top="36pt" right="72pt" bottom="36pt" 

				alternation="EvenPages"/>

	</PDF>

</PDF>

Specifying a new value for the PageSize element does not adjust the settings of these elements. If these values are important to your workflow, you should set them explicitly.

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