I've created an InDesign document with a dark blue background (check linked photos), set to CMYK. When I try to export the document to PDF (note: i have tried every possible setting) the background colour fades, as if it was set to RGB - even though I have made sure to set everything as CMYK. I have tried to export it with press quality, highest quality, different versions and you name it - and nothing seems to work.
How can I fix this?
What's the colour breakdown in InDesign?
What's the colour breakdown in the PDF?
InDesign preview is not 100% reliable
Viewing a CMYK pdf in Acrobat is not reliable as you're viewing on a RGB device.
The CMYK values is what matters here, I would say.
Are you viewing the PDF in Acrobat or are you using some other PDF viewer? If you are using a different viewer then try Acrobat.
Make sure the traansparency blend space and your swatch colors are all in the same color model.