I just did a little math for a test, actually I let PS do the math for me, but as long as the file type is TIFF or another Lossless format, a 17mb image should produce a printable 8X10. If they are outputting to a JPG, I would have to pass. Reprocessing a JPG is almost never a good plan. The actual numbers for a full frame scan, TIFF with no compression, of a 35mm negative at 16.8mb yields a 2984px by 1964px image, that yields an image of 11.5in by 7.6in image at 260ppi. I repeated the test with a deferent image to see if the math lined up, and though not exact it was close. Of course the quality is going to depend on the scanner and the person and or program doing the scanning. But it may be worth a shot if you dont own a film scanner. If you do have a scanner, doing the scanning yourself, would be a much better approach.