Scribus Output

PDF

 * The PDFs generated by Scribus are of very high quality and should never be a problem when delivered to a print shop.
 * Bugs related to the PDF generation are treated with very high priority by the Scribus team.

PDF/X

 * Supported versions: PDF/X-3 (1.3.3.x and 1.3.8+), PDF/X-1a and PDF/X-4 (1.5svn only, no backport possible).
 * ICC profiles must be installed.
 * You have to enable color management.
 * You have to fill the "info string" in the "Pre-Press" tab of the PDF export dialog.

Forms
Basically, forms created by Scribus can be filled with Acrobat Reader and Okular.

Embedding and/or outlining fonts

 * Scribus will try to embed your fonts when exporting to PDF.
 * Fonts with more than 2048 glyphs will be automatically converted to outlines to reduce the size of the PDF. This font-specific setting can be changed in Preferences > Fonts by unchecking the "Subset" option for a font.
 * Embedding fonts exposes you to all the vagaries of font coding. Outlining is always a safe choice, because it moves the font interpretation to your computer, where you have full control and visibility on the end result