Reversing whiteboard effect in photos
 

Hello. I'm new here, so I'll say hi here -- I've been using a BB Storm since July 2009 and love it!

I was experimenting yesterday with the color options on the camera just to see what they would do and I took a couple of junk/test pix with the "whiteboard" color effect enabled. Today, when trying to take pix of some Colorado scenery, I forgot that feature was still enabled. Now I have (to me) useless pix. Is it possible to reverse that whiteboard effect in some photo editing software like GIMP on my laptop?

Thanks for any help. I searched and didn't find anything similar in any of the forums.

Allan