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Brightness control and blue light filter

Brightness in the application can be automatic like the system brigtness or user cat set custom manual brigtness. Brightness can be changed in the book settings, or by the left size of the screen (move up or down). Negative brightness can make screen more darker then system brightness. Negative brightness enable blue filter with Black color by default, you can change for custom color.

     

Blue light filter

Blue light works together with brightness

     
http://librera.mobi/wiki/faq/brightness-control-and-blue-light-filter/