Wow-- thanks for supplying the original scan, Phil!
I've similarly color corrected the original (as well as did a quick bit of clean-up to even out the lighter blue on the right, and get rid of a few dark spots and image flaws), and reduced it to the same 1024 x 599 size. The reduction route gives much nicer results than blowing up a small image, since the final picture retains a lot of the texture of the original, which my blow-up wouldn't have had, even if it were sharpened.
Looks decent enough, I'd say...
-Kevin