[Blindmath] Questions re InftyReader from a Novice

[Sarah Jevnikar]

Hi all,
I just downloaded a trial version of InftyReader and have some questions.
I have a 400+ page textbook that was sent to me as a pdf file. This presents
several challenges for InftyReader.
1. The program can only scan, as I discovered, documents that are 300 pages
or less. How can I split up a pdf file?
2. How can I "clean up" the pdf file so that all images are black and the
DPI is set to 600?
Thank you for your help.
Sarah Jevnikar