OK, I solved this on my own. I'll post the solution here in case anyone else ever needs it.
In CompizConfig Settings Manager, I went to the section on the ADD Helper plugin. In the "Misc. Options" tab, there is a "Window Types" field. Initially, it read:
Code:
Toolbar | Utility | Dialog | ModalDialog | Fullscreen | Normal
I changed it to read:
Code:
(Toolbar | Utility | Dialog | ModalDialog | Fullscreen | Normal) & !title=GIMP$
This specifically excludes any window whose title ends in the letters "GIMP", like the GIMP Image Window. Now, my transparency does not affect that window.
Thanks to everyone who read my post, even if they didn't know the answer!
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