// RGB2CMYK.jsx 
 
var myCols = app.activeDocument.swatches; 
 
for (  i = 0; i < myCols.length; i ++ ) 
	try  
	{ 
		if ( myCols[i].space == ColorSpace.RGB ) 
			myCols[i].space = ColorSpace.CMYK; 
	}  
	catch(e){} 

tell application "Adobe InDesign CS3" 
	tell document 1 
		repeat with a from 1 to count of every color 
			try 
				set space of color a to LAB 
				set myLab to color value of color a 
				set myLum to item 1 of myLab 
				set myKvalue to (100 - myLum) * 1.1 
				set space of color a to CMYK 
				 
				set {w, x, y, z} to color value of color a 
				set color value of color a to {0, 0, 0, myKvalue} 
			end try 
		end repeat 
		--display dialog "All document colors are now CMYK" 
	end tell 
end tell 

tell application "Adobe InDesign CS3" 
	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 
		display dialog "All document colors are now CMYK" 
	end tell 
end tell 

tell application "Adobe InDesign CS3" 
	tell document 1 
		repeat with a from 1 to count of every color 
			try 
				set space of color a to RGB 
			end try 
		end repeat 
		display dialog "All document colors are now RGB" 
	end tell 
end tell