PDF/X-1a

[Padam87]

• PDF must be version 1.3 or earlier
• Page must not be separated
• OutputIntent must be present
• OutputIntent must contain exactly one PDF/X entry
• OutputConditionIdentifier required in PDF/X OutputIntent
• Destination profile must be embedded or Registry Name must be filled out
• OutputIntent Info key must be present
• Destination profile must be ICC output profile (type ‘prtr’)
• Only DeviceCMYK and spot colors allowed
• Fonts must be embedded
• LZW compression prohibited
• Trapped key must be True or False
• GTS_PDFXVersion key must be present
• Invalid GTS_PDFXVersion (PDF/X-1a)
• Invalid GTS_PDFXConformance (PDF/X-1a)
• CreationDate, ModDate and Title required
• Document ID must be present in PDF trailer
• Either TrimBox or ArtBox must be present
• Page boxes must be nested properly
• Transfer curves prohibited
• Halftone must be of Type 1 or 5
• Halftone Name key prohibited
• Embedded PostScript prohibited
• Encryption prohibited
• Alternate image must not be default for printing
• Annotation and Acrobat form elements must be outside of TrimBox and BleedBox
• Actions and JavaScript prohibited
• Operators not defined in PDF 1.3 prohibited
• File specifications not allowed
• Transparency not allowed

Missing PDFs:

• Transfer curve
• LZW compression
• Halftone
• SeparationInfo
• PostScript
• OPI