MJBenito said:
I’m working on Premiere Pro with Lumetri color adjustments[…]
Thanks a lot for your insights. I want to start doing that as well, as the silly color grading of the UHD BD of “Training Day” (otherwise a welcome improvement over the BD) similarly annoys me, asking to be “fixed”.
https://caps-a-holic.com/c.php?go=1&a=0&d1=18089&d2=18105&s1=207597&s2=207955&i=0&l=0
In this case, considering the Open Matte version is sourced from a h264 4:2:0 8 bits encoding, I thought the whole 4K Filmized Remaster process would have worked in the same color space… Only to find that the final image had banding and macro blocking issues.
Yes, the reason for that most probably is that during the conversation, not only get the color values shifted around, multipied, divided, etc., but furthermore in the more versatile floating point domain and then transfered back to integers, necessarily getting rounded to the 8 bit (or rather ~ 7.78 bit equivalent, as video signals often only use the values 16-235, so called “limited range”) which then results in distortion; at 8 bit per color perceivable as banding.
My guess would be that for some reason, as so often, no dithering is applied which at 8 bit is a must to avoid banding artifacts. For instance, many Blu-rays also have lots of banding embedded which would not be necessary at any bit depth if one accepts the higher noise floor in return.
That’s why I made a V2 from scratch using 4:2:0 10 bits for the whole remastering process. You’ll surely notice differences from V1 to V2 during deep ocean scenes and final scenes of the movie.
Good move. While dithering is desirable even at 10 bit, probably it isn’t noticeable anymore and when dealing with lossy codecs, higher bit depths might be preferable to dithered 8 bit due to the additional noise it creates. On the other hand, you added some to simulate the film grain anyway. Interesting that it apparently didn’t act as dithering itself to prevent the banding here.
Of course I’ve seen the post regarding the HDTV version but I wanted the best encoding available for the open matte. Even if that means a little more DNR baked in the source.
I contacted him as it would be interesting how that version looks but most probably yours will win overall by cleaner encoding source alone, yes.
Superb work of yours anyway and the fresh/neutral colors are a pleasure compared to all the official releases.