How do I change the password of a sparseimage?

I searched for an answer to this question, but the information I found was out of date. Apparently there used to be a "Change password" item in the "Images" menu of Disk Utility. Now (under Mac OS 10.7, a.k.a. Lion) it seems there's just a "Change" menu, and when I try to make changes, it tries to make a new image rather than simply changing the password. The sparseimage file I want to make the change to is massive (410 GB), and I don't have room (not to mention time) on any other disks to make another copy. It seems odd that one wouldn't be able to change the password fairly easily. Thanks for any help you can offer.

i just had these question too, and i just find out how to do it on mountain lion, just go to utility disk, and select the desire sparceimage from the side bar, ( if you have the disk image open you need to exit first, or you wont be able to select the change password option,  on disk utility   top menu, go to > file> change password - after that you just select the sparseimage and change the password.
if disk image is mounted it wont work,

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