I have set my tablet (Impression I10) to use the lowest possible brightness. When I open Cool Reader, the screen becomes very bright until I close or minimize it.
This is bigger problem with Night Mode.
I am using 3.0.55-32 from F-Droid.
I'm not sure if this is the intended behaviour or is it just Impression I10 which has many problems. http://mkaysi.github.com/articles/complaining/ImpressionI10.html