limiting touch on transparency for several objects

OK, here's my question...
I'm doing a character creation screen, where you have several bodies, arms, eyes, etc... to choose in order to create your character. Parts change when you press a button in a menu bar, no problem with that.
To choose color, you tap on each part and it fills with a random color. My problem is that, if you touch near the body part (within its original png file size) it also changes color. I know that maybe i can solve it with masks (can i apply masks to sprite sheets?) but i want to know if there's any other way.
Should i treat everything with physics? Is there something i'm missing?
Thanks everybody! Great forums and community!

views:1395 update:2011/11/26 9:01:35
corona forums © 2003-2011