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Because I am reading lots of pdfs from the screen, the white background make my eyes tired. Is there a decent lightweight pdf reader that can invert colors of everything on the page?
I have tried Adobe Reader and Foxit Reader but they only allow to change document colors, if a document is a scanned document everything stays the same.
Alternatively to the answers below, you could install f.lux - it will make your screen's colors warmer at night, thus making it less tiring to read.
– gronostaj – 2013-03-28T19:54:30.240