NeverarGreat said:
What type of radical changes?
My understanding is pretty limited but my sense of the state of things is the original negative of by the time they did the special edition had lost lots of its colour and so when they printed it it looked darker/heavier and all the colours looked redder. So blues would come out more purple and stuff like this. It seems to me more than rearranging the information that is there around, additional colour information has to be programmed back in somehow, either through colour matching from other sources or adding fresh new layers on top of old. Or the spoiled/darkened colours that are there rolled back (reprogrammed) to their unspoilt state. These are just my crazy ideas though. I don't know how to do them practically