Adobe ACROBAT 3D Manual page 638

About preflight
To verify that your Adobe PDF document contains only the features, fonts, and formatting
that you've specified, use the Preflight tool to inspect the document's contents. Preflight
analyzes the contents of a PDF document to determine its validity for print production and
other conditions, but it never corrects a document. While Preflight is most often used to
identify issues that affect printing, it is also useful for determining information for various
elements, such as image transparency and resolution, or PDF version compatibility.
Before you use Preflight or output an Adobe PDF document, make sure that your PDF
document meets the following generally recognized output criteria:
Adobe PDF documents created using Acrobat Distiller, Adobe InDesign, or Adobe
Illustrator should be optimized for print or press using the predefined settings in Distiller
or InDesign PDF styles, or using settings provided by your prepress service provider. You
can use Preflight to see which job options were used. (See Using default Adobe PDF
settings files or see the chapter on creating PDF documents in the Adobe InDesign and
Adobe Illustrator user guides.)
Use CMYK or DeviceN (the Adobe PostScript 3 color space for representing common
elements such as duotones, tritones, and quadtones) in a four-color process job. PDF/X
prohibits the use of any color other than CMYK and spot colors in documents.
Embed all fonts from within the authoring application. (See Accessing and embedding
fonts.) Embedding ensures that the original font is used to output the text, rather than a
substituted font.