I need help with two things
1st off - I have an image, a piece of duodenum which i need to convert into areas by colour i.e. instead of having a full colour picture i need a silhouette of the tissue and also i need to identify the non-tissue areas with other colours such as white and green, so in effect going from a 256 colour image (or whatever!) to essentially a 3 tone image with the piece of duodenum in black, but i'm not really sure how to do it.
Secondly, once i get those areas defined ...