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Question: How to shoot pix in 4inx6in?

We really like this camera. Had for 2 plus years. But -- How do you set it to shoot pictures in 4x6 mode? When we download our pictures the are huge!!! 10 inches by 16 inches. We have to go thru the time consuming process of resizing each picture. There must be a way around this. We just got back from vacation and have 900 pictures to work through.