Encrypted blank disk image, actually encrypted or just password protected ?

I created 200 GB blank disk image on external drive using disk utility with options 128 bit encrytion. I have thought that the data copied to the disk is just password protected not encrypted as such.
I came to conclusion as when you encrypt Mac internal HDD, you can see encryption/decryption progress in Time Machine(system preferences) where as I do not see any encryption/decryption progress for encrypted disk image while copying huge data.
Anyone knows about it ?

As of OS X 10.7.4, Disk Utility had a bug that prevented it from creating an encrypted disk image with a password of more than 10 characters. I haven't checked recently to see whether that bug has been fixed, but from your report it seems not to have been. There is a workaround, but it's complicated.

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