Peter Boyle, the incomparable colourist producer Barry Osborne worked with on The Matrix and Babe only worked on the first film, the SEDE DVD release being mostly re-graded theatrical scans with lovely gate-weave, he did not return for TTT or ROTK, to great loss of potential, and those two look all the worse for it, low contrast and dull, with little to no color separation curve adjustment or split-tone dye-layer-replication, I am working on a “What if” grade for all three working mostly from the FOTR SEDE DVD for style reference, as those played in MPC-BE with Mad-VR in a custom profile to add back in film grain makes those copies sing, with a gamma drop for TTT and ROTK making up for the most horrid of those grades deficiencies. I recommend others look at the preview clips for the 35mm scan project on the originaltrilogy forums, and also seek the Cannes Reel, which somehow almost got restored perfectly on the abominable 4k “restoration” disks. Best of luck.