Preview has quite a few tools that let you use the shared graphics routines from iPhoto.
So, you could dump the photos into iPhoto and play with them (it's surprisingly good for free), or do the same in Preview.
I'm not sure those paragraphs made total sense...
*EDIT* I was typing total balls. iPhoto is the one I was thinking of, not Preview.
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Snaptophobic BloggageHeather Kay: modelling details that matter. "Let my windows be open to receive new ideas but let me also be strong enough not to be blown away by them." - Mahatma Gandhi.