Just playing with the test version of Acrobat. It's relatively simple to replace an image with its full-resolution grayscale version. Only, then there is loss of contrast. This is unexpected to me. For details, see my question in Graphic Design Stack Exchange.

Quote Originally Posted by mwenz View Post
Convert Colors is the dialog you want. Let me know if you have that panel/dialog box.
Indeed, it's possible to convert color images to grayscale, but again there is the issue with loss of contrast: An existing RBG encoded grayscale image washes out when processed with the Print Production tool. This happens with both conversion profiles that I tried, Gray Gamma 1.8 and Gray Gamma 2.2.

I am preparing a document for digital print (laser).