This is an edited version of a post I made on another board recently:
Though I know a lot of people are upset about Vader's "No" in the forthcoming Blu-ray DVD release, the biggest issue I have with this release is that a glaring effects mistake/error in A New Hope will still not be fixed:
Obi-wan's lightsabre flickering out at various times during the DV/Obi-wan battle on the Death Star is, IMHO, the most glaring mistake/error in the entire OT. Even back in the day, this marred that otherwise iconic scene for me. As far as I know, the only reason for this error(s) was the special effects limitations back in '75/'76 when the movie was first filmed (or, rather, when the effects were later added).
I was dissapointed that this wasn't fixed for the '97 SE. And, I was even more dissapointed that it wasn't fixed for the 2004 DVD release.
Note that the lightsabre effects on the Falcon (while Luke is training) were improved in at least the 2004 DVD release - granted, the lightsabre appears to be green-ish at times, but it still looked better than the completely white lightsabre it had been previously.
Also, the Darth Vader lightsabre effects during the Obi-wan battle were improved in at least the 2004 DVD version - this is especially notable when DV walks towards the closing blast doors w/his lit lightsabre.
In any case, it's strange that this extremely obvious & glaring lightsabre error will not be fixed/tweaked for the Blu-ray release. Very strange, since this would seem to be an obvious candidate for improving. I'm not an FX expert by any means, but how difficult would this have been to do?! Lflm. made plenty of other changes/additions in the films that seemed much more complicated/elaborate, i.e. the added scenes in Mos Eisley with the Ronto(s), additional street scenes, etc.; the much more advanced/improved attack on the DS with the X-wings (including seeing into the cockpits of the X-wing fighters); the added scenes in Cloud City (both outside & inside); the added/changed scenes in the Jabba's Palace sequences; the ending celebrations (in ROTJ) on the various planets, etc.
Too bad, since I would actually purchase a Blu-ray Player (which I don't have yet) for the sole purpose of buying these films on Blu-ray if this mistake had been fixed...