So I was fooled by this and thought that CMYK conversion of grayscales actually happens, while it does not. More importantly, it is totally incorrect output intent (something that does never happen when you use CMYK/8 color mode and PDF/X based methods in Affinity apps), and also causes Adobe Acrobat Pro to display wrong color information in the Output Preview. Web Coated (SWOP) V2' while I have ISO Coated V2 (ECI) as my Affinity CMYK default, so I do not know where Affinity Publisher gets this. I wanted to add a note on situation where you have a CMYK document with grayscale images but also color objects (which is off the topic as OP's situation is not this) in which case this would not work.īut now that I tested PDF-X-based behavior when using Gray/8 document color mode and Greyscale D50 color profile I need to correct myself and say that I was confused by incorrect assignment of color intent, which when I export with default PDF/X1a:2003, PDF/X3 and PDF/X4 is for some odd reason 'U.S. Another option is to export as X-4 pdf with a grayscale profile selected, which does not convert colors but embeds the grayscale profile AND an 'Output Intent' which gets used when opening the pdf.
