Do any instances of RGB get converted to CMYK on output to PDF?

Question

Hi,
I'm producing a HUGE catalogue that I've inherited from another designer. It will be going to print soon and I'll be providing the printers with a press ready PDF. The catalogue contains hundreds of individual blocks of colour (used to show colour options for a product). All of them are currently made of an RGB mix. Without having to go through each and every one changing to CMYK (there's no instance of each colour in the swatches pallet), is there a quicker way? Also, is it necessary anyway if I'm providing a PDF - I assume they get converted to CMYK in the final PDF?
I've used InDesign for years but never inherited a previous design with so many RGB items in it!
Thanks.

Answer 1

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
            try
                set space of color a to CMYK
            end try
        end repeat
    end tell
end tell
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.