How do I tell if a disk image (.sparseimage) is encrypted? Is there a way to confirm that an image is encrypted? When I choose "Get info" in Finder, it reveals nothing, and when I use Disk utility I also can't seem to see the information.

I know I could try mount it on another machine and see if I need to use a password, but I'm looking for a clean way to get OSX to tell me that it's encrypted.
from the command line you can use 'hdiutil isencrypted {image-name}'.

bash-3.2$ hdiutil isencrypted unencrypted.sparseimage
encrypted: NO
bash-3.2$ hdiutil isencrypted encrypted.sparseimage
encrypted: YES
blocksize: 512
uuid: FC3C26ED-3056-4F98-8248-DD2F16B39357
private-key-count: 0
passphrase-count: 1
max-key-count: 1
version: 2
bash-3.2$