I'm new to photography and I own a GH2. When I take pictures where my subject is in the shade but there's sunlight hitting a spot behind them (like the floor or a wall), the picture will have the correct exposure on my subject but the area being hit with the sunlight will be way over exposed where it's just all white. What are some tips you guys can offer so that I can avoid this from happening? When I shoot pictures I press the shutter half way while being pointed at my subject then I click away... I noticed that I have a histogram display, but I don't know how to read it. Will understanding that graph help?