3DAP recommends PDF files be created to the ISO PDF/X-1a:2003 standard as specified in:

ISO 15930-4:2003
Graphic technology -- Prepress digital data exchange using PDF -- Part 4: Complete exchange of CMYK and spot colour printing data using PDF 1.4 (PDF/X-1a)


For more information:

http://www.iso.org

http://www.prepressure.com/pdf/basics/pdfx-1a

http://www.pdf-x.com/

http://www.planetpdf.com/creative/article.asp?contentid=6541

 

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