In order to maintain a high quality
final image, while keeping your file size reasonable, here is a
general guideline of output sizes.
|5 inches by 7 inches - 3 Mb
|8 inches by 10 inches - 6 Mb
|16 inches by 20 inches - 12 Mb
|20 inches by 30 inches - 24 Mb
Remember that what is important in
your prepared images is file size, not the physical size. Keep in
mind that the quality of your images is also affected by things,
such as the LPI of the lens ( lenticular sheet ), and the quality
of your original image.