The way to cotrol image size on the board is to change the number of pixels in the graphic. For example, Photo Delux has a size feature that lets you size the graphic by inches (as in 5x7 inches) or in pixels. We've found that using 600 or less pixels on the longest side of the graphic (the other side is set automatically), it will fit properly on a board page. (As in 400x600 pixels to follow the above example in inches.)