Global night modes for rooted Galaxy S2, maybe S3, maybe note

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http://www.mobileread.com – I've been making an app that provides global (i.e., working in all or almost all apps) night mode for rooted Galaxy S2 and maybe Note and S3 devices. For instance, one option turns the screen to red-and-black (white goes to red, black goes to black, everything else goes to shades of red; you can also reverse it so white goes to black and black goes to red); another turns the screen to green-and-black, another turns whites to sepia, another turns off blue pixels (blue light at night keeps one awake, people say, so this might make it easier to read oneself to sleep), etc. I like to read gre (HowTos)