I wanted to practise with the Powershot G5 indoors because I encounter some problems: often the camera will not focus properly (I do not use flash or any other light besides the light available in the appartment (dark evening with some lamps) and put the camera on "P", use ISO 400 setting, single autofocus + evaluative metering), and sometimes I also have the impression that shots I take of people indoors are too vivid, too yellow and red. Anyone with suggestions how to improve this?