The slightly aqua cast of the first shot is how the glow looks on the Blu-ray. IIRC, Harmy took the glow from the Blu-ray and matchmoved it with the core from the GOUT.

mverta said earlier in this thread that the original color timing looked warmer than we're used to - can we even be sure that the blade showed up as cold a blue on a cinema screen in '77 as in the bottom pic? In the clips in The Making of Star Wars, the blue glow looks a bit warmer (even with the slightly colder bluish white balance of the Japanese LD transfer of that documentary).

g-force - I noticed that too, I think it has to do with Harmy adjusting the sky separately from the foreground, is that blur covering the "matte line"?