Operation Manual

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Last updated 4/7/2015
Chapter 15: Preflight (Acrobat Pro DC)
Advanced preflight inspections (Acrobat Pro DC)
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Analyzing documents with the Preflight tool (Acrobat Pro DC)
Viewing preflight problems inside the PDF structure
For detailed information on PDF structure, see the documents on the Adobe PDF Technology Center at
www.adobe.com/go/learn_acr_pdftechnology_en (English only). If you have advanced knowledge of the PDF file
format, examine the internal structure of the PDF and its fonts for technical reasons for a preflight mismatch. Preflight
includes three options for in-depth inspection of a PDF. Technically skilled users can use these tools to analyze the
objects and fonts that caused a mismatch.
In-depth knowledge of font internal structures, and font specifications for Type 1, TrueType, and OpenType fonts is
important. The font specifications are listed in the bibliography of the guide.
Note: You can navigate the PDF and fonts in the windows that appear, but you can’t edit the PDF structure or fonts.
Browse the internal PDF structure
View the structure of a PDF, as defined by content streams and cos objects, in a tree array. (Content streams represent
pages, form XObjects, Type 3 font characters, and the appearance of comments and form fields. Cos objects include such
items as color space, images, and XObjects.)
Check PDF syntax, view the results of a fixup, or determine the cause of a mismatch. Choose between five view modes
that organize content streams in different ways. You cannot edit the PDF in the Internal PDF Structure window.
Note: Do not confuse the internal structure with the logical structure in tagged PDFs that improves accessibility for low- or
non-sighted readers. The internal structure is a superset of all objects in the document, including tags.
Before you can browse the internal PDF structure, you must run a preflight check.
1 In the Preflight window, choose Browse Internal PDF Structure from the Options menu.
The Internal PDF Structure window opens, showing a tree view of the document information and the document
catalog (the root of the document’s object hierarchy).
2 Expand each tree item to view the document structure.
3 Click the Page button to view the structure of each page.
4 To change how content streams appear in the tree view, select a view mode in the toolbar:
Classic