yes the image processing toolbox is very useful
im just playing around at the moment but one main thing is the ability to move into colour spaces that photo shop does not offer to edit the pic then back to output space etc
eg L C H space to boost chroma very useful
JCh space to add a colour appearance
this link is has some common spaces with the basic code
it doesnt take too long to convert in matlab
ill get back to you once if finishe this interface in building
iain