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             CHAPTER 8                                                           Interactive Features



             trap network annotation, whose Subtype entry has the value TrapNet and which
             is always the last element in the page object’s Annots array (see “Page Objects” on
             page 144). See Section 10.10.5, “Trapping Support,” for further discussion.


             Watermark Annotations

             A watermark annotation (PDF 1.6) is used to represent graphics that are expected
             to be printed at a fixed size and position on a page, regardless of the dimensions
             of the printed page. The FixedPrint entry of a watermark annotation dictionary
             (see Table 8.41) is a dictionary that contains values for specifying the size and po-
             sition of the annotation (see Table 8.42).

             Watermark annotations have no pop-up window or other interactive elements.
             When displaying a watermark annotation on-screen, viewer applications should
             use the dimensions of the media box as the page size so that the scroll and zoom
             behavior is the same as for other annotations.

             Note: Since many printing devices have nonprintable margins, it is recommended
             that such margins be taken into consideration when positioning watermark annota-
             tions near the edge of a page.

                       TABLE 8.41 Additional entries specific to a watermark annotation
KEY             TYPE            VALUE

Subtype         name            (Required) The type of annotation that this dictionary describes; must be
                                Watermark for a watermark annotation.

FixedPrint      dictionary      (Optional) A fixed print dictionary (see Table 8.42) that specifies how this anno-
                                tation should be drawn relative to the dimensions of the target media. If this en-
                                try is not present, the annotation is drawn without any special consideration for
                                the dimensions of the target media.
                                Note: If the dimensions of the target media are not known at the time of drawing,
                                drawing is done relative to the dimensions specified by the page’s MediaBox entry
                                (see Table 3.27).

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