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PDF export: Greyscale document + colour = PDF with colour


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Never had this case before.

Step 1: Create Greyscale document

Step 2: Place PDF CMYK + 1 spot colour

Result: Placed PDF displayed in grey

Step 3: Export as PDF, Colour space like document, ICC use document profile

Unexpected result: Coloured PDF CMYK + 1 spot colour

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Windows 10 | i5-8500 CPU | Intel UHD 630 Graphics | 32 GB RAM | Latest Retail and Beta versions of complete Affinity range installed

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Of course. I am on build 270.

multi-colour.pdf has 1 spot and 2 cmyk colours.

greyscale.afpub has Colour Format Grey/8 and Colour Profile Greyscale D50. Imported multi-colour.pdf. In the layout multi-colour.pdf is displayed as greyscale. Export with PDF (for print) with Colour Space As Document and ICC profile Use document profile and Embed ICC profile checked.

greyscale-export.pdf has 1 spot and 2 cmyk colours.

BTW: If you save a greyscale Publisher document it has no preview icon in explorer (Windows 8.1).

greyscale.afpub

greyscale-export.pdf

multi-colour.pdf

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Windows 10 | i5-8500 CPU | Intel UHD 630 Graphics | 32 GB RAM | Latest Retail and Beta versions of complete Affinity range installed

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Found it. You have to explicitly select Colour space as Grey and ICC Profile to Greyscale D50 in the export to PDF dialogue to make a greyscale PDF. The automatism taking the values from the Document Setup does not work.

Another question: After a document is created and you re-visit the Document Setup there are the buttons for Assign colour profile and Convert colour profile (pre-selected). When is Assign colour profile ever used? Yes, you can select it, but when you re-visit Document Setup Convert colour profile is selected again

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Windows 10 | i5-8500 CPU | Intel UHD 630 Graphics | 32 GB RAM | Latest Retail and Beta versions of complete Affinity range installed

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5 minutes ago, Joachim_L said:

Found it. You have to explicitly select Colour space as Grey and ICC Profile to Greyscale D50 in the export to PDF dialogue to make a greyscale PDF. The automatism taking the values from the Document Setup do not work.

Would you be so kind as to upload the new exported pdf?

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10 minutes ago, Joachim_L said:

Sure. See attached file.

real-greyscale.pdf

Thanks. Only reason I asked is because APub really cannot export a proper black only plate when there is spot color involved. Simply, when using gray output everything should hit the black-only plate. I hadn't tried in a while, so I tried it again using your APub file (thanks for uploading it, too).

It fails a pre-flight check for various reasons. The spot color plate is still present despite it appearing OK in the PDF. Which means there are a minimum of two plates as it is. However, the CMYK colorant still will separate into all 4 plates unless a print establishment specifically chooses a grey ICC profile. While this corrects the CMYK components, it still leaves the HKS 7 spot plate intact. (Technically, the only gray in the HKS plate is an alternate fill color space. This can be corrected in Acrobat, pdfToolbox & most RIP software used by professional printing establishments.)

Mike

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