Take a look at Scan Tailor. This wonderful program will take your scans, split them if you scanned them two up, straighten them and then select the content and create a set of uniform pages. The usual output is single bit tiff files but there is an option for colour or grey scale output. You can then create the pdf directly from the images.
I usually use Scan Tailor to massage the scans before I run them through Finereader for OCR. It always works well for me.
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