xcenter=`convert <image> -format "%[fx:(w-1)/2]" info:`
ycenter=`convert <image> -format "%[fx:(h-1)/2]" info:`


see

http://www.imagemagick.org/script/fx.php

http://www.imagemagick.org/Usage/transform/#fx_escapes


>How do you calculate this?  I'd like to do something like that in one of
>my PHP scripts so folks could input some values and it is autocalculated.
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