By the way, it's quite interesting when looking at this shot from the JSC:

Apparently the interpositive used for the JSC was made in 1985, (and was one of the last interpositives made for home releases) so by then the negative had already faded a bit over 8 years. Then, assuming it was the same interpositive used for the DC, they let that IP fade for 8 years too before scanning it. That would explain why the lightsaber looks green already in the JSC, and a very desaturated greenish-white in the GOUT.