Ok well they orginal photos are corrupt so I only have the emailed ones. So
when I'm making them larger in my picture editor I'm using the size of all my
other pics which seem to be 1440 pxsH x 2160 pxlsW for the most part they
look good; some better then others; some grainy. What size would you
suggest?
That's completely up to you. Generally resizing a photo by a factor
less than two can produce quite pleasing results--especially if followed
by a little sharpening. Resizing a picture more than a factor of two
tends to produce a very "soft" photo. If you're seeing pixellation
or "graininess", either try a smoother photo resizing method or resize
by a smaller factor.
-michael
"The wastebasket is our most important design
tool--and it's seriously underused."