We always convert full-color neutral images using a high-GCR profile to significantly reduce the CMY in the highlights and midtones, to avoid a color cast on press. Using this method has worked extremely well in preventing minor-but-unwanted color casts, as the highlights and midtones have plenty of black to compensate for any minor ink variations. For example c43 m34 y35 k6 (a slightly lighter than middle grey) would end up as c12 m8 y9 k38. This of course only applies to offset printing; digital printing should not have any trouble printing full-color neutral images without introducing an unwanted color cast. Brian On 7/26/16, 11:49 AM, "Jorge ." <chocolate.camera@gmail.com> wrote:
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
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