__hh
Well-known
The 3:2 masking of the LCD is hidden deep inside the menus somewhere. I've used it but can't for the life of me remember how to get to it again.
The 3:2 "thing" for the G10 is only a guide on the screen (see p66 of your manual) - it greys out the perimeter so that you can estimate the photo in 3:2 ratio. The image is still recorded as 4:3.