Printing images in black and white from PDFs

[Viv Matthew <viv -at- looksmart -dot- co -dot- uk>]

Hi Whirlers
We have several pdfs containing (literally) thousands of colour
images, many of which are simply grey window screenshots. In previous
doc releases the printers have put b&w pages through one machine and
those pages with 'real' colour images through another.  However this
has caused a variety of problems with collation etc so we are keen to
avoid this for our upcoming release.

We are now looking for a way of printing the b&w images in b&w whilst
maintaining the colours in certain images.  The images are a mixture
of gifs and tifs, and we're using Frame 6.0, Distiller and Paint Shop
Pro. 
We've tried converting the images to greyscale and fiddling with the
Distiller Job settings but so far without luck.

Is this possible?  What do we need to do (we accept we may have to
replace colour pages in final PDFs)?  I've searched the archives and
frameuser archives but to no avail.  

Thanks in advance for any help (even if it is telling us it's
impossible!)
Viv



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