how would i set stuff like brightness,gamma,and contrast?
Sorry, but JOGL doesn’t currently provide APIs for controlling these as they’re strictly speaking outside the scope of OpenGL. However there is an RFE about this which we’ll try to address.
They are available if you use LWJGL:
http://www.lwjgl.org/javadoc/org/lwjgl/opengl/Display.html#setDisplayConfiguration(float, float, float)