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mjut

CMYK and spot colour / changed colours in PDF export

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Hello forum,

I hope, someone can help me out with setting up a Publisher document:
The colours used are black (from cmyk) and one spot colour. By writing the PDF for printing, all texts (set to 100% black in Publisher) are being transformed to "rich black" containing cmyk colours. (Nooooo!)

How can I prevent 100%-black-elements from being converted to some cmyk colour?

I've found a suggestion to create a solid colour for 100% black. That solution is not working for me: I am using greyscale photos as well. So now the created PDF contains three colours. The first spot colour, the black from the greyscale photos and the spot colour I created to prevent texts converting to cmyk.

That is very annoying, I need the PDF to be used only the black from cmyk and the one solid colour.

Is there a soloution for this?

Thank you guys for suggestions / help.

Cheers

 

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I just solved the issue. I was blindfolded not seeing the obvious. This post lead me to the solution:

By making sure, the colour space was correctly set in Publisher *AND* in Acrobat professional, it seemed good.

Sorry for spamming the forum.

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On 1/17/2020 at 4:24 PM, mjut said:

Sorry for spamming the forum.

It is nothing of the sort. The way color is handled in Affinity apps and when exporting to different file formats is very much "live" because of these kinds of issues. What is important, it gets improving and becoming more consistent. But "PDF/X"-based export methods are basically the way to go when using Affinity apps, otherwise you need to run a series of test exports to find out what kinds of results different settings cause in regards to non-standard based exports done from within Adobe apps. One crucial difference is that Adobe apps do not by default include color profiles in non PDF/X-based exports, and accordinbly do not cause this kind of illusory problems.

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Thanks @Lagarto

Yes, I was aiming for a propper PDF/X export... Unfortunately, I couldnt get it to work. It runs into an error (discussed here on the forum as well)
In my case, the reason is the used font. Without fonts, PDF/X export is working as expected. With fonts: no luck.

 

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3 hours ago, mjut said:

In my case, the reason is the used font.

Do you mean that you need to have fonts converted to curves to be able to create a PDF? What kind of font causes this error?

Did you try customizing the PDF/X-based exports by just using "Text as Curves" option but otherwise using the default PDF/X settings? Or do PDF/X-based exports fail even when using this option?

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I have to look into this on Monday. Its a PostScript Type 1 font. If I am remembering correctly. (I am not at the office right now)
I thought about the "Text as curves" option as well. I ll try and report on Monday.

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@Legarto you pointed me into the right direction!
Doing the PDF/X based export with the option "Text as Curves" enabled is working fine. This seems to be the most consistent workflow for creating printable documents.

By doing these tests I ran into another colour-issue: I am Placing a drop-shadow on a spot colour. by doing so, the colours in the PDF will be rendered as the undesired CMYK as well. I am not sure how to address this. The wanted PDF-Output is the use of two colours only: black and one spot colour.

spot-colour-test.afpub

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I can't see, that the green area is spot, but anyway the colour of the (different blend modes) drop shadows contain all 4 colours. Reduce it to black only.

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Thanks @Joachim_L

I did copy the spot colour from a different document. It is spot (I can confirm that in Acrobat)
Also, I set the colour in the drop shadow to 100% black.

I am not sure what to try next..

settings-in-publisher.thumb.png.d74bb2959f13dd40ffb4b472c603d9da.png

 

 

Acrobat.thumb.png.9733574aeeabe1656c554e991224cd8d.png
 

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This is what I see how your drop shadow is defined. After I change this and export as PDF X-4, you can see the result. Strange ...

acrobat.jpg

drop-shadow.jpg

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:/
umm.
I have no idea why this is happening. I double-checked all the settings. (I attached the file)

I think, I am overseeing something completely. This test is very important for me – We, as our office, are thinking about a complete switch from Adobe to Affinity.. The color settings is pretty essential for this task.

 

spot-colour-test2.afpub

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Same as before. Drop shadow has 4 CMYK colours. Try my attached version for exporting as PDF. My final advice would be to reset APu completely by holding CTRL while starting the programme. But be aware that everything you customised get lost, so make a backup of everything you might have customised (if possible).

spot-colour-test3.afpub

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Okay,

the reset did the trick:
I found several reset-options in the applications settings. (I dont know the shortcut for starting up / reset in MacOS)

Now, I am getting the correct PDF-output from my documents as well. I understand, that this is something Affinity is still working on. I hope, the workflow for the colour settings gets improved with later releases. Although, it might just be me learning pretty slowly...

@Joachim_L Thanks for your help! And as you were pointing out: There seems to be some improvement in 1.8. I cant wait to get the next version released.

Cheers
 

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1 hour ago, mjut said:

Now, I am getting the correct PDF-output from my documents as well. I understand, that this is something Affinity is still working on. I hope, the workflow for the colour settings gets improved with later releases. Although, it might just be me learning pretty slowly...

I think it is Affinity, though: the K100 shadow will be rendered in four colors if you export using PDF/X-1a or PDF/X-3.export methods (which force flattening of the transparencies). It keeps it limited to K only when using regular (print) settings or PDF/X.4 that do not flatten the transparency of the shadow. See attached InDesign and Affinity Publisher created PDF-X1-a exports of the same content.

test_pdfx1a_apub.pdf

test_pdfx1a_id.pdf

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Alright. This is a helpful comparison.

If set up correctly, AP does not handle the shadow as overprinting black. InDesign does it the right way. As being seen in your comparison.
It seems to be a commonly known issue:

 

 

 

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