S E C T I O N H .3
1127
Implementation Notes
during printing. Although these options have varied from one Acrobat
version to another, the default behavior is as follows:
1. Select the media size and orientation according to the operating sys-
tem’s Print Setup dialog. (Acrobat has no direct control over this pro-
cess.)
2. Compute an effective crop box by clipping it with the media box and
rotating the page according to the page object’s
Rotate
entry, if speci-
fied.
3. Center the crop box on the medium, rotating it if necessary to enable
it to fit in both dimensions.
4. Optionally, scale the page up or down so that the crop box coincides
with the edges of the medium in the more restrictive dimension.
The description above applies only in simple printing workflows that lack
any other information about how PDF pages are to be imposed on the
output medium. In some workflows, there is additional information, ei-
ther in the PDF file (
BleedBox
,
TrimBox
, or
ArtBox
) or in a separate job
ticket (such as JDF or PJTF). In these circumstances, other rules apply,
which depend on the details of the workflow.
Consequently, it is recommended that PDF files initially be created with
the crop box the same as the media box (or equivalently, with the crop box
omitted). This ensures that if the page is printed on that size medium, the
crop box coincides with the edges of the medium, producing predictable
and dependable positioning of the page contents. On the other hand, if the
page is printed on a different size medium, the page may be repositioned
or scaled in implementation-defined or user-specified ways.
168. Acrobat viewers do not make use of the “to CIE”
(AToB)
information in an
output intent’s ICC profile.
169. Acrobat 5.0 does not make direct use of the destination profile in the out-
put intent dictionary, but third-party plug-in extensions might do so. Ac-
robat 6.0 does make use of this profile.