Quote:
Originally Posted by G B-S.
I used the bicubic option as it was the default. Presumably this is best.
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Yes - the 'cubic' bit means it's taking information from all the adjacent pixels to form the new pixels.
I haven't used GF (although I've got a free sample CD somewhere that allows 30 free goes before it cuts out - and no doubt then keeps reminding you to buy the damned thing

).
'Amateur Photographer' did a test some time back and GF came out best with the 'bit at a time' method described above by Don coming in second and the basic bi-cubic third, though with the quality of magazine reproduction I don't think there was that much difference visible to the reader - you have to trust the comments of the reviewer.
Whichever method you use, the best results will come when you use it to make a larger print than normal - big prints are usually viewed from a greater distance where the loss of resolution won't be too visible! When you try to enlarge a cropped area you're starting with the resolution 'stretched' to begin with and you'll probably be looking at it from the same distance as your full-frame images.