ColorSync or other to reduce pdf size

I'm having a devil of a time with prints to pdf ending up at 40 or 50 Mb and scans doing the same.
I was advised to dowload ColorSync but can anyone help me figure out how to use this to downsample pdf's? I'm reading the help and can't figure it out.
Also, when printing from PREVIEW to pdf are there settings or pulldowns which I can use to set the DPI or otherwise keep the file size down??
Thanks.
Jon

Hi. Thanks. I am on OSX 10.6.
I have two issues.
1. PDF's are huge and I need to downsize them periodically.
2. I need to prevent them from becoming huge when I print (but I also need to /downsize/ them when I have them on my hard drive and they are too big to email or keep that way on the HD).
I am a new user so can you help me a little here?
What are the steps to getting to the image you show? Say I have five images or scans open in Preview. You are showing me how to print to pdf but in a way that will keep the file size small, yes?
If so, I go to Print or Print Selected and then what? Do I have the "Preview" pulldown set in this dialog, do I have the Format pulldown, do I go to the pdf pulldown in the lower left hand corner?
I have not been successful with this but I'd like very much to be.
Thanks!

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