Image spam again

I try to take a thorough thinking about image spam. It is too bad for me to realize that image spam can defeat anti-spam engine in the server side apart from paralysing key-word filter or Bayesian filter in the client side. This is because in every spam generated, the image contained in it is a bit different from the other. On the anti-spam engine, file hashing can not work as the hash values of image files are not matched. I wish IT people in the email anti-spam field soon come up with quick solution to deal with inage spam. I am a victim suffering from the image spam nuisance.