Colours becoming washed out when saving as PDF on Photoshop
I have a few images that are in RGB that I need to save as PDFs before printing, but the colours are seemingly changing and becoming "dull" when I save as PDF. This doesn't happen with JPG, PNG, or SVG. I have tried to stop the problem by saving setting the colour conversion to "No conversion" but that hasn't seemed to change anything.


Additonally I heard that it could be an issue to do with the PDF reader I am using so I installed Adobe Acrobat Reader but that is showing the colours in the same washed-out way.
I have attached screenshots of the save as PDF settings that I have used, as well as screenshots of the colours as they appear in photoshop vs. PDF.



