CHAPTER 8
644
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
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
dictionary
(Required)
The type of annotation that this dictionary describes; must be
Watermark
for a watermark annotation.
(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).
FixedPrint