Viewing preflight problems inside the PDF structure

If you have advanced knowledge of the PDF file format, you may want to explore the technical reasons for a preflight mismatch by examining the internal structure of the PDF and its fonts. 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.

For detailed information on PDF structure, you can use the Adobe PDF Reference Guide, Version 1.6, 4th Edition (English only) on the Adobe website. You should also have intimate knowledge of font internal structures, or have font specifications for Type 1, TrueType, and OpenType fonts at hand. The font specifications are listed in the bibliography of the PDF Reference 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 Internal PDF Structure: Shows the data structure of a PDF in a graphical way. The Internal PDF Structure window displays every Cos object (an object that describes how another object behaves) inside a PDF, using a tree view to display the internal PDF structure. When you run a fixup, such as removing private data, you can check the results in the Internal PDF Structure window. For more information on this topic, see the Adobe website.
Browse Internal Font Structure: Opens a font browser for the selected font. This option is available only if a font is selected in the preflight results. Because this option goes directly to a specific font, it can be useful if there are multiple fonts in the PDF, or if you want to compare the internal data for two fonts in a PDF. (You can open more than one font browser for a PDF.) For more information on this topic, see the Adobe website.
Browse Internal Structure Of All Document Fonts: Opens a font browser for all fonts in the current PDF.