Well... I've tried all that, and unless I'm doing it incorrectly, it doesn't work.
here's the original image, sized down:
http://www.stanats.com/gal01/zp-core/i.php?a=pregnancy-delivery&i=03.jpg&w=300&h=199
here's acrylian's suggestion. magnification increases:
http://www.stanats.com/gal01/zp-core/i.php?a=pregnancy-delivery&i=03.jpg&w=300&h=199&cw=300&ch=199
here's your suggestion (looks like its using the full-size image instead of scaling it down):
http://www.stanats.com/gal01/zp-core/i.php?a=pregnancy-delivery&i=03.jpg&w=300&h=199&cw=250&ch=150&cx=50&cy=49
interestingly, if i take cx and cy away, it SHOULD be the same image without shifting, but it's not:
http://www.stanats.com/gal01/zp-core/i.php?a=pregnancy-delivery&i=03.jpg&w=300&h=199&cw=250&ch=150
if i'm doing this incorrectly, can you simply write the correct string so i have an example?
if i'm doing what you suggested, however, then i'm still at a loss as to how to size down an image and then crop it.
sorry if i'm nagging you guys; it just seems like this should be relatively easy to do, but maybe it's not.