Disappearance of elements in a PDF when flattening

I suspect that this has been discussed before, but we have set up a publication and receive announcements PDF from many sources, so I don't know how they are built. Sometimes, if we flatten the PDF or open it in Photoshop, elements will disappear. Sometimes just a part of a logo will disappear, and if no one notices us, the publication ends up having to refund the customer. Any ideas what is the cause and how to avoid it?

The real question is why in the world you're flattening PDF for your ads. Simply place in InDesign, for example, the export of PDF (PDF/X-4 preference) and let the RIP mix properly transparency based on the exact conditions of printing and color management. You should never, repeat never, repeat never again open PDF presented for the placement of a publication in Illustrator or Photoshop and place the results in your publication. You are simply trying to ruin your content and get no benefit whatsoever!

-Dov

Tags: Adobe Developers

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