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Adobe PDF reduce size for printing maintain quality

Hello,  

I have a pdf file and it has about 150 pages.  The file is 40MB and I would like to reduce the size but maintain 100% quality for printing.  When printing to one printer it takes about 5-10 minutes to spool.  On another printer it spools instantly but then the printer stops and thinks a lot.

How can I reduce the size but maintain quality for printing?  I have acrobat professional 7

Thanks,
Kurt
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Karl Heinz Kremer
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Looks like images are taking up 77% of the space.  I'll try  your suggestions.  Thanks.
There is one problem with just Acrobat: It does not tell you what the image resolution is without tricking it into doing that...
You  can "abuse" the pre-flight tool to determine the image resolutions:
Select "Advanced>Preflight".
On the preflight dialog select "List all images". Once you execute that profile, you will end up with a preflight report. You will see a tree node titled "Continous tone image resolution higher than specified (x matches on y pages)". Expand that node. This will list all images in your document with the size and resolution specified as (width)x(height) pt (in points) (resolution) ppi. You can also find the color space used for the image on that line.

Hope that helps.