In a few months I will be snorkeling in the Caribbean. I have a Sony DSC N1 with an underwater housing on order. Rather than spend a bunch of $ for a filter, I'd like to use one of the camera's white balance modes to approximate an "underwater" mode. This camera does not have many choices: auto, daylight, cloudy, fluorescent, incandescent, flash. There's no custom option.
Any hope for getting better colors in this setting? Can colors be corrected with software, later?
Thanks

