|You may also want to look at the resolution setting on your camera. The higher the resolution, the larger the picture will be in size. |
My digital cam is pretty low-end and I know the higher my resolution setting, the less pictures I can fit in it's memory. Ergo, the lower the resolution, the smaller the image file is (and vice versa).
Take a test shot or two with your present res setting then reduce it one or two settings and take identical test shots. Do that all the way down to your lowest res setting and compare sizes and quality of images.