Are the bulk of your images .png or .jpg. JPG files should take less space then .png files. You can also alter the amount of (lossy) compression if you are willing to give up some quality. Jpg compression works by breaking the image up into 8 x 8 squares starting at the upper left corner. In each 8x8 square reduces the number of different colors in the 64 dots. For example if there are 2 red's and 2 light blue's that are very close to each other, the program reduces it to 1 red and 1 light blue, and marks both reds the same and both light blues the same. The more compression you ask for when doing the compression the more colors are removed and made the same. The trick is to reduce the number colors until it starts to show. Just consider that in the 64 dots they are all a shade of green, then reduce the number of shade's to 4 to 6. This would be a big compression without much change in color. If on the other hand the 64 colors are all over the rainbow, cutting the number of colors down to 4 to 6 could be very destructive. One way to help the compression when you are doing graphics over pictures is to reduce colors that do not matter as much. If your background is a blue gradient with pictures on the background. By changing the background to a solid "Single" color of blue, the compression will not waist any colors on several shades of blue. Each 64 bit square is considered separately when doing the compression.
