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Dear Affinity Users and Developers We’re just in the process of evaluating Affinity Publisher (tested with 220.127.116.115 and 18.104.22.1682) and we’ve come upon a problem with the PDF/X export: In our workflow our print PDF files are checked in Adobe Acrobat against the preflight profile PDFX-ready Sheetfed Offset Classic HQ V1.5. Among other things this profile checks the MD5 checksums of the used ICC profile against a pre-defined list of profiles known to be appropriate for offset printing. When exporting a PDF as PDF/X-1a with the ICC profile ISO Coated v2 300% (ECI) from Affinity Publisher the preflight returns this error: Looking at the preflight report in the section Output Intents I noticed a difference between a PDF exported from InDesign and Affinity Publisher: The Output Intent is stated as ISO Coated v2 300% (ECI) for the InDesign-PDF and as ISO Coated v2 300% (ECI) (Custom) for Affinity Publisher The Color Management Module had a value of HDM (InDesign) and lcms (Affinity Publisher). Primäre Zielplattform (in English probably: Primary Target Platform): empty (InDesign) and Apple Computer, Inc. (APPL) (Affinity Publisher) Profil erstellt mit (in English probably: Profile created with): Heidelberger Druckmaschinen AG (HDM ) (InDesign) and lcms (Affinity Publisher) The other fields were the same in both files. So I suspected this to be the reason for the different MD5 checksums. But not being an expert on the ins and outs of PDFs and colour management I turned to HilfDirSelbst.ch where we discussed this (in German) in this thread. Olaf Drümmer of callas concluded (my translation): So the question is Is Affinity Publisher correct in changing the meta-data of the profile when writing the PDF file? And if so: Would PDFX-ready need to append their list of MD5 checksums to include those of profiles created with lcms? Any insights and suggestions would be greatly appreciated! Best phph