You_Too said:
Well the thing with these movies is that I think most of the adjustments might be done with curves, not hue/saturation/luminance. ... When you have nothing to compare to, and watch the movie like that you might not even notice the green tint. ... but they just like doing it that way these days.
No need to sell me on R-G-B -- that's my speciality (http://originaltrilogy.com/forum/topic.cfm/Star-Wars-OT-1997-Special-Edition-Blu-rays-Info-by-Team-Blu/post/630232/#TopicPost630232). :) Asaki's point was how changing the picture hue for the fire's color might effect the sky's color ... to support his original contention.
But this universal trending towards teal requires a conspiracy theory -- new-world-order conspiracy, and color theory. I'll submit the latter, here.
Could it be that these film companies are trying to expand the colorspace of their HD releases to mimic the distribution of 4K/8K UHD? (Of course, in that case, I would think it is wrong-headed and wrong-applied.) Notice the "D65" white-point is centered in the UHDTV triangle while off center in the HDTV:
If they tried to reposition that point to center it in HDTV, it would decrease Red content while increasing Green and Blue ... precisely what would make for a teal tint. Hmmm ... food for thought.
Whatever the reason, Peter Jackson (and company) did it too late, and too strong, and too wrong in TFOTR. By the time TH:AUJ rolled around, they corrected the "too late" (now done in production), corrected the "too strong" (if we're willing to accept the blanket tinting in the first place), and corrected the "too wrong". This last part is shown by comparing the 2 movies for TFOTR's wrong overall darkness and black crush:
TLOTR: The Fellowship Of The Ring EE The Hobbit - An Unexpected Journey
Comparing similar locations from blu-ray.com's review caps, the R-G-B crushed values (R/or/G/or/B=0) are luminance-inverted to expose the damaged areas with maximum color/brightness. TFOTR is riddled with them. TH:AUJ has few if any. However, PJ is still not keeping the black points and the white points their proper shades of grey, resulting in green snow & clouds, and a fog-of-darkness in bright sunlight!
Properly adjusted, it might've looked unobtrusively acceptable [TOP = theatrical; MIDDLE = extended edition; BOTTOM = theatrical properly adjusted]:
For the proper adjustment, the blacks & whites remain at their original points by adjusting only gamma and midtones (here in a paint program). Adjusting the Red channel downward, the Blue channel less downward, and the Green channel unaltered, will produce a teal tint but it will also darken the picture. Instead, Red is adjusted down, Green is adjusted up, and Blue is unaltered. This way, the average of the channels is still the original brightness, while the relative proportions of the channels is still the same to produce a desired teal.