Why are my Pictures dark?
Because you did not give a clue to what powershot model you have, I have to keep my answer less specific.
Every camera has a setting, called automatic. On Canon cameras most of the time it is a green or black camera logo on the main dial.
It also could be you chose one of the scenes programs, like shooting on the beach or in snow.
When you switch to automatic, all pictures should be more or less correct. The camera should prevent you from taking pictures when there is not enough light, in automatic.
If your camera is in automatic, and the pictures are still to dark, something else must be wrong. If the automatic trick works, read the manual, to check when you can use the other modes.
on Jun 03, 2014