Your XL image is just 3721 x 4556 Pixels (16.95 MPixels), what resolution did you use or what size of film you used.
I'm assuming 10in on the long side? so you used 460 DPI (give or take a few)
Or did you just scan a 3.2x4.5 in section?

PS.. just noticed.... Half the resolution DUH!

Quote Originally Posted by David A. Goldfarb

Titrisol--At 1000 ppi, you get a 16 MB jpeg level 8 file, not 16 Mpix. 8000x10000 pixels=80 Mpix. At 4000 ppi you would get 1.28 Gpix.