1) LOOOOOL!! Like in Sony phones!! Nokia was the one who came up with light sensor waayy back in 6630.

Yeah N82 does have light sensor. The brightness depends upon the ambient light.
2) Activate Stereo Widening or change the equaliser.
3) Go to colour settings and see whether Vivid is active. Or maybe some other effect is active.
4) Plastic surgery for your fingers.