Adobe ACROBAT 3D Manual page 632

About document boxes
Using Acrobat, you can define several rectangular areas (or boxes) on a PDF page, or
preview those areas if they were defined in a PDF document created in another application
that uses PDF 1.3 technology, such as Adobe InDesign. You can view these document
boxes on the page in the Acrobat document pane or on the page preview on the right side
of the Crop Pages dialog box.
You can view document boxes by selecting Display Art, Trim, Bleed Boxes in the Page
Display preferences. A bleed, trim, or art box appears in the page preview in a default
color, which you can change using Page Display Preference settings. However, if the box
colors are already saved with the PDF document, Acrobat uses those colors when you
open the document.
A PDF 1.3 or later document can include the following types of document boxes:
Media box (or page size) contains all the objects of a page, including text and images that
appear on the page or that bleed or extend off the edge of the page. Acrobat discards
objects outside the media box when creating PDF files.
Bleed box represents an extended area around the trim box at which all page content is
clipped if a bleed area is present. A document that requires a bleed also requires a bleed
box. The bleed box must be smaller than the media box, and can be the same or larger than
the trim box. Printer marks fall outside the bleed area.
Trim box represents the final trimmed size of the document after printing and trimming. A
document intended for commercial printing requires a trim box. The trim box must be
smaller than the media box, and can be the same as the bleed box.
Art box represents an area of the page (for example, a piece of clip art) to be positioned
when the PDF content is placed in an application, such as a page layout program. The art
box must be smaller than the bleed box. Trim and art boxes may have the same
dimensions.
PDF document boxes A. Media box B. Bleed box C. Trim box D. Art box