Enter the size you'd like for the resized pictures. Most likely you will also want to check the box for "Constrain Proportions," otherwise the images dimensions will become distorted. With this enabled, you only need to enter one of the numbers for height or width. Here are some suggestions for the new image sizes:
If your recipients will only be viewing the photos and you want to keep them small, try a size of 800 by 600 pixels (resolution does not matter in this case).
If you want your recipients to be able to print the pictures, enter the desired print size in inches, and set the resolution between 200-300 dpi. Keep in mind that the larger you go for size and resolution, the larger your files will be, and some settings may make the images larger rather than smaller. A good conservative setting for this is 4 by 6 inches, and 200 dpi resolution for medium quality prints, or 300 dpi resolution for high quality prints.
