Re: How to get pure black shadows in RGB workflow
Re: How to get pure black shadows in RGB workflow
- Subject: Re: How to get pure black shadows in RGB workflow
- From: Mike Eddington <email@hidden>
- Date: Thu, 30 Dec 2004 19:07:44 -0500 (EST)
- Organization: North American Color, Inc.
> They want to build mechanical shadows for many of the images (mostly
> catalogue product shots), and they want to do that in Photoshop CS.
> The images are then saved, with the shadow on its own layer, as PSD.
> Optimally, the CMYK conversion should then be done later, either with
> InDesign or even after the PDF has been created. When the shadow is
> created in RGB, problem is, that the shadows get to be made out of
> all four CMYK colors, when the ideal case would be pure K. The CMYK
> numbers are of course depending on which press profile is used. But
> even with a heavily acromatic profile, there's still a fair amount of
> CMY. In the press that can cause the color of the shadow to shift
> away from neutral.
>
> Any suggestions on how to solve this issue??
Don Hutcheson has made some strong arguments for 4/c drop shadows rather than K-only :
-graybalance errors on press are less apparent (grays in image match grays in shadow regardless of press drift)
-screening is the same between product and shadow (as opposed to a rosette in the 4/c image next to a single channel shadow)
-press misregistration issues eliminated (white lines between k-only shadow and product when registration drifts).
I've seen all of these issues in catalogs I receive.
Another Don H. tip...you can create shadows in RGB and convert to a K-only profile. The K-only profile being created by choosing 100% CMYK Max and 100% Black Max in profile creation, then edit the profile reducing CMY curves to zero....but this may create a workflow issue in InDesign as the shadows need to be converted to a different profile than the rest of the images.
mike
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