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Is there an easy way to convert this PDF: https://archive.org/details/nightscenesofcit00talm to this PDF: https://archive.org/details/nightscenescity00talmgoog I print out old books I find scanned online and many of them have a dark background. I can convert the color background to grayscale but it still uses a lot of ink. Is there an easy way to do this? I'm not a computer geek so it must be a program that is easy to use. I have Adobe 11. Thanks, Marty

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