My camera takes really dark photos. I noticed this recently. I thought it was only because the place was not well lit. Last night we were taking pictures in a well lit area and it still appeared as though we were somewhere dark! I asked my friend to take the exact photos and upon comparison theirs appear the same and normal while mine was dark! I reset the camera settings to default but that did not fix it. I tried no flash, with flash and auto flash but it did not make any difference.

What could be wrong?