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Open it up in Preview, then click File and go down to export.

Bunches of options there.
attachment.php
 
And then it all depends on the quality.

If you want to post here I would use .jpg

IMO better than the rest.
 
Open it up in Preview, then click File and go down to export. Bunches of options there

I know how to change it once I take the shot. I wanted to know if you could change the shot before taking it.
 
as vniow said, it is the best and all the equipment and software you need is in the default install. Besides, unless you need to see the mouse, or do a movie, or a timed shot (i.e. for showing menus) then snapx pro iss a bit much. besides it aint free - preview is ...
 
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