Colors change when saving Photoshop file as PDF
I have a bunch of Photoshop files (all CMYK) that I need to save as a PDF to send to a printer for a colourproof. It is very important that the colours stay exactly as they are in Photoshop. However, whenever I save the Photoshop file as a PDF, the colours change drastically (see image).
I have tried flattening the image, but this didn't make a difference.
I only have Photoshop (no Illustrator) and I use Windows.


