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gordo

Still converts Black only to 4/C

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1 minute ago, walt.farrell said:

As I said, the K Only support/option seems to currently be only in Designer, and possibly only in Designer for Windows. As Publisher clearly has the same issue, I expect we'll see that support in Publisher in an upcoming beta release, too.

This bug has been there over many versions. Considering it's a key issue one would have expected it to be dealt with by now.

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7 minutes ago, gordo said:

This bug has been there over many versions. Considering it's a key issue one would have expected it to be dealt with by now.

Considering only Publisher, which is the subject of this topic, the problem has never existed in a released version, but only in beta versions of a new product :)

(And considering "key" issues, each of us has our own list of which issues are key, based on our own personal needs.)

Considering the full range of Affinity applications, it may have been there over many versions, but I have no information on when was it first noticed and reported to Serif. It may have been reported only recently, for all I know. (On the other hand, there are many old, reported bugs, which Serif is working on using their own prioritization scheme and timetable, and balancing their available resources between fixing old problems and doing new development. Not all of the bugs can be fixed as quickly, or with the priority, that all users would prefer.)


-- Walt

Windows 10 Home, version 1809, 16GB memory, Intel Core i7-6700K @ 4.00Gz, GeForce GTX 970
Affinity Photo 1.6.5.123 and 1.7.0.293 Beta       / Affinity Designer 1.6..5.123 and 1.7.0.293 Beta    / Affinity Publisher 1.7.0.293 Beta

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The K only box is related to images only, essentially allowing you to output them to 1 channel. The issue you're encountering Gordo (at least I think it is) is that your Outer Shadow colour has not been saved as K only - the file attached in the first post is Rich Black.

Now I will say there is a known issue that the colour model drop down in the Filter Effects dialog doesn't show the selected colour model - this is a known issue that is with development. I wonder if this has lead to some confusion and has incorrectly changed the colour along the way.

See my attached video - I've opened your file, and the Filter Effects colour swatch (not the values) definitely shows a Rich Black. If I then switch this to CMYK and change to K only, outputting to PDF is definitely going out as K only.

Could you attach a video showing your export process please, as you've said earlier on in the thread doing that doesn't work for you.

Thanks!

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Please see attached vid and its PDF

I also tried duplicating the steps that you followed in your video. But I did not get the same result as you did :-(

I have no idea why it's not working for me. :-(

Hang on, I have an idea. I'll get back in a moment.

Test.pdf

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I think I know what the problem may be.

Although the PDF has an embedded  profile it does not have a rendering intent embedded (I believe that InDesign calls this "Output Intent Profile Name")

When Acrobat opens the PDF it expects to see a rendering intent (likely true for many RIPs). If it does not see the rendering intent then it simply ignores the embedded profile and assigns an arbitrary profile and 100K gets rendered as a 4/C rich black.

Depending on how a prepress RIP is set up, you will either correctly get 1 black plate or you will incorrectly get 4 plates (one for each of the colors in the now rich black)

PhotoShop (a simple RIP) opens the Publisher PDF and displays it correctly as a CMYK file with image content only in the K channel.

Affinity Photo, on the other hand, opens the PDF and displays it as a CMYK file with image content in all channels. I.e. Affinity Photo converts the one color (K) PDF into 4/C (rich black)

I can't see a way in Publisher to embed the rendering intent (as can be done in InDesign) which would eliminate the issue.

So this lack of ability to embed the rendering intent will be problematic in production with folks getting unpredictable results.  :-(

 

 

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9 hours ago, gordo said:

I think I know what the problem may be.

Although the PDF has an embedded  profile it does not have a rendering intent embedded (I believe that InDesign calls this "Output Intent Profile Name")

When Acrobat opens the PDF it expects to see a rendering intent (likely true for many RIPs). If it does not see the rendering intent then it simply ignores the embedded profile and assigns an arbitrary profile and 100K gets rendered as a 4/C rich black.

Depending on how a prepress RIP is set up, you will either correctly get 1 black plate or you will incorrectly get 4 plates (one for each of the colors in the now rich black)

PhotoShop (a simple RIP) opens the Publisher PDF and displays it correctly as a CMYK file with image content only in the K channel.

Affinity Photo, on the other hand, opens the PDF and displays it as a CMYK file with image content in all channels. I.e. Affinity Photo converts the one color (K) PDF into 4/C (rich black)

I can't see a way in Publisher to embed the rendering intent (as can be done in InDesign) which would eliminate the issue.

So this lack of ability to embed the rendering intent will be problematic in production with folks getting unpredictable results.  :-(

 

 

Thanks for getting back to me Gordo,

I've just looked at this Output Intent option in InDesign and it is only for PDF/X formats. I've done a text export using PDF/X-4 preset and it gives the Output Intent profile (listed under the Simulation Profile in Acrobat) as the one you're using, so we do output this, but only where it is valid in PDF/X formats.

Watching your video you've made a document using U.S. Sheetfed Uncoated v2, but then using the simulation profile in Acrobat of U.S. Sheetfed Coated v2, this is why it is happening in the video. Changing this Simulation Profile to the profile used in the document is giving the correct results. 

With regards to Photo I only get the 4 channels if I enable 'Convert opened files to working space' in Preferences > Colour. With this option disabled, opening your PDF in Photo outputs both the text and the image (because the shadow gets rasterised) as K only.

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