PDF-Export problem: Black Text is not 100 % K in PDF

[LuckyLuke60]

I know that there is annother Question with the same Title.
And in deed: I have basicly the same problem.
I use Designer and my file is in Greyscale color with the Geyscale D50 profile.
My grafic file has black text and some grafic rectangles in black.
All the black is set to 100 % K.
Then I export to PDF and when I check the PDF, all text and the grafic rectangles are 82 % black.
I have attached the afdesign-file and the PDF.
What can I do, to get this right?
Thank you for your help.

 

stammbaum3.afdesign stammbaum7.pdf

[walt.farrell]

What export Preset did you use, and what options did you have specified in the More... part of the Export dialog?

[LuckyLuke60]

I used the compatiblity of PDF 1.4, ... as it is a gray document, I only can use the Gryscale D50 ICC Profile.

[lacerto]

You have Gray/8 document color space but the objects are defined in CMYK and have K100 as their color values. In Affinity apps, this (oddly) does not translate to G0 in grayscale color space but instead to an RGB based color value which in D50 profile translates to G18 in 0 to 100 range grayscale ramp (or 82 % black in terms of K). That value will be used no matter whether you export using the document color profile and PDF 1.4 (resulting in pure gray defvce color space), or using a CMYK color profile at export time (in belief of being able to keep the K100 color definitions unchanged this way).

When you have a grayscale document color space, you'd need to define pure black as Gray value 0 (using the Grayscale slider mode of the Color panel). You can correct this easily in Affinity Designer by selecting one of your objects having K100 fill, and then choosing Select  > Same > Fill Color. Then apply G0 color value on them and export as you did in your screenshot. You do not seem to have strokes with color values so you probably do not change anything else.

An alternative would be changing the document color space to CMYK mode (File > Document Setup > Color) making sure that you do not change the CMYK color profile you are initially offered (since if you choose to not use that, the K100 definitions will change to four-color black). If the offered CMYK color profile is not appropriate (it might be the default US SWOP Coated V2), you can subsequently change it to something more suitable but making sure that you use the "Assign" option when using File > Document Setup > Color tab. 

Because of this complexity, it might be a good idea to create the document in CMYK color mode if your goal is to export process black. Interestingly, you could also create a document in RGB color mode and specify your colors in CMYK (e.g. C0 M0 Y0 K100) and export to CMYK, and the K100 color definitions would stay; but this is not possible in Grayscale color space. So instead of changing the document color space to CMYK as advised above, you could equally well change to RGB, and then export to CMYK and keep your K100 definitions!

[LuckyLuke60]

First of all: thank you both for helping.
In deed, while trying to find a solution, I came across that Grayscale, where I had the value of 18 - G18.
But when I put it to G0, it mixed up the CMYK Entries to 85/85/35/95 which I thought would not work anyway - so I did not even try.
Now I see a LITTLE bit more clear with that matter.
Thank you very much Lagarto!
Walter

[lacerto]

33 minutes ago, LuckyLuke60 said:

But when I put it to G0, it mixed up the CMYK Entries to 85/85/35/95 which I thought would not work anyway

It is because the gray values in Affinity apps are actually RGB values so G0 would be R0 G0 B0 which based on underlying RGB and CMYK working profiles would in CMYK preview or export be translated to something like you mentioned (a four color black).