If you convert to a CMYK destination profile on export the RGB colors will be converted. You understand, though, that many RGB colors have no CMYK equivalent and will be converted to the nearest in-gamut color which may not be even close, right?
Hi, yes I thought they would but wanted to check if they got converted whilst making a PDF. I'm aware they might not have an equivalent CMYK but thanks for confirming that.
Do you know any quick way to convert all the boxes in InDesign to CMYK anyway, as they are not listed in the swatches panel?
You can add them to the panel by opeing the panel flyout menu and choosing Add Unnamed Colors, but I don't know an easy way to change the definitions to CMYK en mass.
I think you could try by selecting all the RGB swatches in the swatches panel and then alt click to open the Swatch Options panel and then select CMYK in the dropdown menu.
It can also be done via scripting. This is AppleScript:
tell application "Adobe InDesign CC 2014"
tell document 1
repeat with a from 1 to count of every color
set space of color a to CMYK
Also the converted CMYK numbers you get depends on the document's assigned CMYK profile (or the Color Settings' CMYK Working Space if there's no assignment). And the Intent and Black Point Compensation you choose in Color Settings can have a significant effect on the conversion numbers.
Many thanks Guys, that's really useful.
Back to the original question, there is nothing wrong with leaving them as RGB, and keeping them as RGB in the PDF. Many believe all design should be in RGB and so should the PDF, to give maximum control to the print shop. Not everyone agrees, including many print shops. Of course the RGB should be accurately profiled.
Not everyone agrees,
It's easy to come up with scenarios where either color mode causes problems downstream.