Are you talking about the image being damaged on your PC or the flash card from the camera... It is always important to never remove data cables until the red light goes off or you run risk of data corruption also after taking shots in your camera, it is possible to corrupt data.. You could look at software such as http://www.ontrack.com/easyrecoveryfilerepair/ which may do the trick 

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt