This refers to the video codec. x265 allows for high-quality 4K video at a manageable file size without losing the immense detail found in the 35mm scan.

This marks the specific release version of the restoration. Why Fans Prefer 4K77 over Official Releases The primary draw is the theatrical cut . In 4K77:

This indicates a full 4K resolution scan. It provides a level of detail—from the texture of the desert sand on Tatooine to the grain of the film stock—that 1080p simply cannot match.

The colors in 4K77 are timed to match the original Technicolor prints, avoiding the "blue tint" found in many modern Blu-ray releases. How to Find and Watch

Retains the natural film grain. It looks like a "gritty" theatrical projection.

A version where the grain has been digitally softened for a cleaner, more modern "digital" look. Most purists prefer the No-DNR version for authenticity.

If you are searching for terms like you are looking for one of the most significant fan-led restoration projects in cinema history. What is Project 4K77?

The Definitive Guide to Project 4K77: Experiencing Star Wars in Its Purest Form