I’ve read that they went back to the original negatives of the scenes shot and the original film for the special effects and bluescreen ships and things and scanned all of that and digitally re-composited that back together?
I do like them removing the matte lines and blending that all back. I really hate matte lines. And I can still remember the terrible matte lines of Luke and that Rancor thing in Jedi.
I also like them fixing some of the lightsabers and fixing errors like the red arm in the Wampa scene very early on in Empire.
One thing is I wish Harmy would have left in the fixed matte lines and other fixes like them removing that red arm in the wampa scene.
I really wish the Blu-Ray release of older movies in general that they would at least digitally remove the matte lines. I’ve got the Goonies on Blu-Ray and really hate the matte lines when the kid is looking through the hole in the coin. I just wish they’d gotten rid of matte lines as even in the 80’s, those matte lines would stick out and take me out of the movie.