Konador has already touched on the aspect ratio issue, but I thought I'd
add a little more just to be clear.
You're going to experience this problem when changing aspect ratios. As you
may already know, standard 35mm film has an aspect ratio of 1.5 = 3:2 = 6:4,
which is why standard film shots look correct on 4x6 prints. However, even
in this case, 8x10 must crop the original shot in order to be correctly
printed. While there are some cameras (mostly DSLRs) with a 3:2 aspect
ratio, many (or most) of them (like yours) have an aspect ratio of 4:3
(which is like most televisions). Unfortunately, this aspect ratio means
that prints of any standard size (4x6, 5x7, 8x10) would be cropped.
Ideally, you would crop (a copy of) your image before printing, along with
other editing you normally do. Of course, it means you have to know your
target print size ahead of time and/or save multiple copies for each print
size.
QImage can address this anyway. It supports the use of filters and you can
define a fixed aspect ratio cropping window which is applied during printing
as a filter. It means you can keep your original and simply have a filter
applied during printing without affecting the original. I prefer this method.
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