Printing a 4x6 scanned image to a 8x10

I'm scanning old 4x6 wedding photographs at a resolution of 600 on a
Canon scanner. After I do all my editing in Photoshop and cropping it
to the right 1:1.25 ratio to fit on a 8x10, do I need to resize my
image to an 8x10 and do the right proportions for my pixels or is the
fact that being at a resolution of 600 and properly cropped sufficient?
I typically send my photos to Costco for printing.

If resizing is truly needed, what resampling optios should I use and if
I should use resampling at all. Any help is greatly appreciated.

Today spoke these views with conviction for everyone's
edification:

> I'm scanning old 4x6 wedding photographs at a resolution of
> 600 on a Canon scanner. After I do all my editing in
> Photoshop and cropping it to the right 1:1.25 ratio to fit
> on a 8x10, do I need to resize my image to an 8x10 and do
> the right proportions for my pixels or is the fact that
> being at a resolution of 600 and properly cropped
> sufficient? I typically send my photos to Costco for
> printing.
>
> If resizing is truly needed, what resampling optios should
> I use and if I should use resampling at all. Any help is
> greatly appreciated.
>
In my experience scanning even professional photographs, there
is seldom more than 300 DPI of real image information. But,
scanning at 400-600 DPI would still be my choice as it is free
and only slightly slower and you would get enough PPI for a
decent 8 x 10 print.

But, if the original is fuzzy or noisy or has any noticible
defects, it won't matter much how many DPI you scan at. You
can mitigate but not eliminate most defects but if the
information really isn't in the original, chances of a "good"
8 x 10 drop pretty fast.

Best advice: try a couple and see for yourself.

Incidently, once you've cropped to taste, resizing up will
only reduce image quality. But, if you mean resizing to change
the apparent PPI for some custom print house, then it won't
matter. But, if you're starting with a 4 x 6, I'd save one
version at that aspect ratio and another at 8 x 10 ratio. Why
throw away information you may want later.

One man's opinion, YMMV...

--
ATM, aka Jerry