Deleted due to double posting
#1. "RE: Print size for D1H images" | In response to Reply # 0BJNicholls Charter MemberMon 24-Jun-02 01:42 PM
By resolution alone the 2000 x 1312 image size gets you 6.7" x 4.37" at the "ideal" output resolution of 300 pixels per inch. In practice, you can create clean enlargements twice that size without resorting to much, if any, oversampling to avoid pixellation. The printer you're using plays a role in what output resolution is acceptable.
The file format will only affect the relative quality of the image (jpeg compression creates artifacts - more visible with higher compression levels), it won't alter the baseline resolution limitations.