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Hi..
New to the forum, so I hope this isn't a question that's been answered a million times. I couldn't find an exact answer when I searched.
We have a PDF created in MS Publisher (I know!) and it has grayscale and color images in it. When printed to our color copiers (higher-end type Canon and Creo) the grayscale images are using all 4 colors. Obviously, this isn't wanted as it's needlessly wasting ink.
Is there a way to "fix" this in Acrobat 9 (on a Mac)? Is there a way to make the PDF see grayscale images as just black?
Is this something that needs to be done from the client's end when the make the PDF from Publisher?
This one is a bit of a head scratcher!
Thanks...
Bob
My Product Information:
Acrobat Pro 9.2 / Macintosh
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There are many places in the print chain where the GS->CMYK change can happen, so the first thing to establish is if the images in the PDF are actually using 4 plates. In Acrobat Pro, use the Output Preview inspector (menu..advanced..print production) to look at the images in question by hovering about with your mouse - you can filter by types of object etc. so you're only looking at the images, then look again with everything visible.
If the images are in grayscale but there's something over/underneath that's in CMYK (even if it's white or transparent) then the process of rasterising the page (done by the printer driver) can often merge the spaces.
If the images are CMYK in the PDF, then either you're using a preset in Distiller that converts everything into CMYK (the PDF/X-1a:2001 preset does this for example), or the Postscript output from Publisher is being sent in that space. Publisher 2003 has a bug that treats 8-bit GS images as if they were CMYK; the fix is at this link:
http://support.microsoft.com/kb/819584
Acrobat Pro has a Convert Colors tool (advanced..print production) but it's not too helpful as you can't apply it to a single object, only a class of objects on a page (so you'd convert every image) - so the only realistic option is to track down where the change is happening and fix it there.
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