Re: Embed causes rich black – a mystery in several acts
Re: Embed causes rich black – a mystery in several acts
- Subject: Re: Embed causes rich black – a mystery in several acts
- From: Matthew Kelly <email@hidden>
- Date: Fri, 14 Aug 2009 13:19:23 -0500
On Jul 27, 2009, at 1:47 PM, Brian Lawler wrote:
1. PDF Presets>Press Quality>Output>Convert to Destination (Preserve
Numbers) AND "Include Destination Profile"
2. PDF Presets>Press Quality>Output>Convert to Destination (Preserve
Numbers) AND "Don't Include Profiles"
In case 1, all of the black text in the document is converted to
CMYK rich black, as described above.
In case 2, the black remains solid, and has no other colors
underneath; it is simple 100% K black.
In both cases everything else in the document is converted to CMYK
(including the RGB).
What happens here is no different than when you convert a grayscale
image in Photoshop to CMYK. It will create four channels of color to
create the black, unless you use a profile conversion for maximum
black. In your file everything gets tagged with the profile,
including the type. When it goes to the output devise, the RIP will
convert everything to the tagged profile, thus the four channels of
color.
Here we prefer to do all of the conversions prior to going to the
RIP. That way we can examine the file and check for unexpected
conversions. When we do the conversion in Acrobat, we make certain
that "Preserve Black" is selected.
Matthew Kelly
Prepress Supervisor
Litho Press, Inc.
4334 Milling Road
San Antonio, TX 78219
210-333-1711
email@hidden
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