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Topic: Making graphics separate?
Conf: (P-PDF) Developers, Msg: 54634
From: matthew180
Date: 5/29/2002 05:07 PM

I was not sure if this was more of a developer question or a prepress question. I posted in prepress first but it may be out of scope for that list...

I am creating PDFs on the fly for a print house. I am using a PDF creation library. The requirements of the printer are to have all colors specified with PANTONE colors. This is not a problem for things like text and graphics elements that can be defined within the PDF, like lines and such, for those I can use a color space of /Separation (as opposed to /DeviceCMYK or /DeviceRGB.)

Now, graphics are proving to be a problem. When the PDFs are printed, the text and graphic elements separate out on to their respective plates, i.e. one plate for each PANTONE color used, but any images print on their own plate. This is the problem. The images are set to only have as many colors as the other text and graphic elements, usually only 1 or 2 colors, same PANTONE number, etc., but the PDF does not seem to accept or retain the PANTONE color information independently for the graphics.

So, I tried to make a PANTONE TIFF image in Photoshop and I could not do it. I had to "save a copy as" and select a format that I am not familiar with, some special form of EPS. This EPS would print the graphic as a separation just fine, but when I ran it through Distiller, the PDF that was generated would not print as separations. So, this leads me to believe I cannot have images in a PDF that will print as separations, specifically as PANTONE color space.

I was hoping for some insight as to the possibility of doing this.


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