The day-for-night scenes on the DVD were terrible - way too dark. In the final shot, there was no way to see that Shane was riding through the graveyard, a very important detail which I always interpreted as Shane slowly dying from his gunshot wound. The Blu-ray has thankfully corrected this. It's still dark, as intended, but not dark enough to obscure the graves, or the tears on Joey's face. Joey's final line has also been restored: "Bye, Shane!"
As many times as I've seen the movie, I'm not sure I ever noticed the graveyard at the end. Maybe I did, and it just didn't register. On the Blu-ray, I thought it had a chilling effect. It could mean what you suggest; it could mean Shane is leaving the killing behind. In any case, it needs to be seen and the Blu-ray shows it quite clearly.
Speaking of day-for-night: I wonder if some here can esplain when and how the night-time filters are applied to such scenes? Are they added when prints are made? For instance, in the trailer for Shane, he is seen riding off in unfiltered daylight. I assume there are instructions as to where/when to use them?
I believe some here have mentioned that there is a scene in the Blu-ray of The Egyptian that is supposed to be set at night but was rendered as day on the Blu-ray. I noticed several scenes in the Optimum Blu-ray of the 1973 The Three Musketeers that seemed to be lacking filters. In the scene where the chess game is occuring with live animals, the scene is way too blindingly bright and glaring. One feels the need to don sunglasses to watch it as it. Previous DVDs had some sort of filter applied which toned the effect down. And in the scene where D'Artagnan accosts the Duke of Buckingham and Constance in the street, this was always rendered as a nighttime scene, but on the Blu-ray it looks like afternoon sunshine.
So, I'm hoping someone can explain how day-for night filtering is done in films.