Not under normal circumstances. They have been changed.
Your question does not state whether or not the message is known. Any information like that can assist in the detective work that would help make any progress along these lines.
There is another possibility of having more information: For instance, Playboy.com places digital watermarks inside their images. So given a raw watermark and the steganos message, it is theoretically possible to reconstruct what was changed.
Of course, visually it will not matter. That is the beauty of steganography. If there are billions of possible colors and your eyes can really only tell the difference between 50-100,000 of them, then using those low-order bits is visually undetectable.
Where it gets complicated is if you use Steganos to put a message inside an image that already had another, the first one gets lost.