DarkLightHitomi:
...however, once you make enough changes...
I'm confused about what you're trying to say here. Are you saying that an adaptation should make either no/few changes or LOTS of changes? That doesn't make a lot of sense. Every adaptation makes just as many changes as it needs to be the work that [whoever] wants it to be and no more and no less.
DarkLightHitomi:
Like Disney's take on fairy tales, recognizable for the tale they stem from, but so far different that they are more like similar stories rather then one based on the other, thus it doesn't have the original hanging over it.
So why does Disney's The Frog Prince (or, even more egregiously, Pocahontas?) get a pass and not the Hobbit? My argument is that there's no clear defining line between 'some changes' and 'a lot of changes' and 'too many changes' and/or 'the wrong changes.' Every film adaptation should be looked as inspired by the book. in the same way that Disney fairy tale cartoons are inspired by 'the original' and no more.
DarkLightHitomi:
I.E. I could take the lion king but write a similar story about dwarves and elves with the same premise. A dwarf king, his evil brother, and his son. Similar, but no one would be bothered by how different it is from the original.
You could also argue that the Lion King is mostly retreaded Hamlet and few would argue with you.
DarkLightHitomi:
So I consider a movie as true to the source when changes are minimized and done only to account for the difference in medium. Otherwise, quit pretending, and just make something "new" with it's own characters and world.
I would argue that every change is done solely to account for the difference in the medium, once you take into account the process(es) by which the two are created and sold. I don't think anyone is pretending, but rather making the best use of the material that they can, given the circumstances.