Users on CTP-Q, dMacs and Acrobat Talk ...

To everyone that replied to my post: Thank you for the information.
I also posted this on Acrobat Talk, ctp-q and dMacs lists ... I received
several responses and very good input from a variety of resources.

To recap and provide you with some info -

FM: Acrobat Talk, 5/21/99, AM Wrote:

>From Adobe's white paper, "Preparing PDF files for high-res printing using
Adobe Acrobat 4.0":

"Gradients or blends of two custom/spot colors in vector EPS files will be
converted to process colors when you create a composite PostScript file.
They will then separate on the process color plates at the RIP."

It is one of a variety of situations in which Adobe recommends you stick
with a "preseparated PostScript workflow" instead of composite PDF files.
(Other situations include pubs that use DCS files, most duotone EPS's,
most
colorized TIFFs.)

It so happens that I just called Adobe (Illustrator 8) tech support
regarding the spot-to-spot blending issue, and they said it's no different
than in earlier versions of Illustrator. You can blend from a spot to a
different screen of the same spot, or to white, and the separations will
work (ie they'll print out to spot color plates). But if you blend or
construct a gradient from one spot to another, the intermediate steps
convert to CMYK. The only workaround is to create two gradient-filled
shapes, one for each color, and overprint one.

On the other hand, I've never had a problem correctly outputting
spot-to-spot blends made with Quark's CoolBlends feature. (And I guess my
printer--who does the film--has been able to figure it out.)

AM

///////////////////////////////

>From dMacs: 5/21/99 - Shane Steinman wrote:

Hi Scott,

Here is Adobe's official answer...

Spot Color Gradient Fills in PDF Files Appear and Print on CMYK
Separations

Document number 321179 Dated August 12/98

/////////////////////////////////////////////////

These posts seem to close this thread for me ....
Thank you again, very much for all the great input
on this subject ...

Have a great day!

Scott B.
DK&A Quality Assurance
www.dka.com
mailTo:sbancroft@dka.com

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