Pixellated pngs in flash

i’ve got an image that i’ve added to flash after saving from photoshop as a png-24 file. once in flash, the image gets pixellated a little, especially when i preview it (then view the swf afterwards).

any idea on how i can keep the image from pixellating? the more i’m thinking about it, i DID resize the png image(s) in flash to get them to be the right size. would that have anything to do with it?