It's not always convenient to systematically convert grayscale images to CMYK on output. In Prinergy, for instance, the ProcessTemplate's output DeviceLinkProfile (if that's what's being used) *has* to be GCR in order to get GCR-kind of conversion. It has pros and cons. Personally, I decided against systematically converting grayscale images to four-color images for jobs. If a customer wants GCR "grayscale" I'll gladly supply a heavy-GCR ICC output profile for converting in Photoshop. Depends on the job... / Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca@lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Jorge . Sent: Tuesday, July 26, 2016 11:49 AM To: 'colorsync-users?lists.apple.com' List <colorsync-users@lists.apple.com> Subject: Offset printing of black-and-white photographs in a page with abundant color Hi, When placing a black-and-white photograph in a page that will also have plenty of other photographs, illustrations and layout elements in color, part of a magazine that will be printed in offset, is there a rationale for preferring that gray values of that photograph are printed using only black ink or with a mix of all CMYK inks instead? The particular CMYK combination I mean is the one I would automatically get in the likes of Photoshop by converting the grayscale image to the target CMYK color space using ICC profiles. — Jorge