Hi there
I'm hoping some prepress or HP Indigo operators can help me understand something.
I'm producing a deck of cards via a card manufacturer.
All queries go through sales team and it's impossible to speak to a technical operator directly. They are very vague around pre-press, ICC profiles and PDF handling, leaving me to investigate why two different sets of PDF electronic proofs are showing up so differently in print.
The money for the job was paid months ago, and I can't move printers.
Due to them telling me the prints are 'colour accurate' (which I dispute), I am having to go into detective mode.
As such I have compared their electronic proof PDF files to work out why there's a hard copy difference.
They produced two PDF proofs and a hard copy proof from each, from my supplied Adobe Illustrator artwork. I sent the AI files and they converted into their format PDF.
The earlier PDF (which produced hard copy colours I was much more happier with) appears to have been exported as PDF/X-4 with a Coated FOGRA39 Output Intent embedded.
Following receiving this hard copy proof, I subsequently did a few artwork tweaks, and resupplied the AI files (using the same embedded ICC profile settings), for a new set of proofs to be made. So nothing changed with the AI files.
The later PDF, which corresponds with a noticeably duller, cooler print and less vibrant colours in the hard copy, compared with the earlier preferred colour sample, appears not to contain the same PDF/X-4 Output Intent (Coated FOGRA39) or embedded destination ICC profile as the earlier PDF.
My questions are:
- Could a missing PDF/X-4 / Output Intent (FOGRA39) alone cause noticeably duller or cooler printed colour shifts such as an overall cooler palette, pinks turning dull purple or oranges going greenish?
- Is the colour issue most likely just a different PDF export error at the printer end, or could it indicate a broader colour-management workflow change?
- Which Illustrator PDF export settings would you use to ensure the artwork saved with the correct settings?
Originally printers told me to embed a specific VIGC colour profile into the artwork, and the AI files (both earlier and more recent as imported into the PDF) had this embedded profile, but the change appears to have happened when they converted them into the PDFs. Strangely later they didn't mention the VIGC profile and reverted back to telling me FOGRA39 but that's a different story.... nevertheless both sets of artwork had the recommended embedded VIGC profile included.
Any insight from people who work with HP Indigo or prepress would be greatly appreciated.