Problem resizing images in photoshop.

have u got the tickbox unticked that says keep aspect ratio?

if so then basically whatever field you change the res, it will change the other to keep the same aspect of the image
 
Probably because 720*576 isn't a 16:9 aspect ratio

720*540 is a 4:3 aspect ratio which is why yours looks like 4:3

720*405 is a 16:9 ratio
 
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