I am a digital printer and I need to convert several pages of a document whose black is a process rich black to 100 k. I have followed the instructions I found online and used Convert Color and chosen gray gamma 2.2. However this lightens the black significantly. Is there a better setting or process? When I use Preflight to do the same thing and select "Digital Printing BW" the black comes out much darker. The only problem is I can't seem to select a range of pages when I do it that way. Which means I have to remove the color pages and then add them back in after I convert. A giant hassle. Does anyone have any advice?