shanerjedi said:
That's always going to be the challenge replacing existing shots like the original. It was an actual shot, photographed on a stage with everything in camera(exception being the animated lasers).

That's why there needs to be more softer focus on the mtns in the background: to match existing photographed footage.

Otherwise these new shots will make more sense continuity wise but will stand out too much.

That was one of the problems with the Star Wars Special Editions to begin with.

In camera effects have problems too, when you film models infront of a backdrop the backdrop is a surface not a a three dimensional space.

The reason why the in camera effects look so good in Blade Runner is that was a huge model landscape constructed with forced perspective and filmed in a higher resolution format than the live action (light was falling on real objects in a three dimensional space).

In ESB the models were three dimensional as was the ground but the background was a flat painting (a really good one but a flat surface none the less).

Dropping in a backdrop after the event at least allows for that background to be adjusted to correct any flatness that might come from that technique.