Since the movie "Interstellar" was shot on film, how was it released on Blu-ray disc?

It’s very simple. The film source after shooting on film can be converted into digital format through equipment, and naturally it can be made into Blu-ray or any other digital storage medium. This technology has been around for many years.

There are three ways to make digital movies: one is computer-generated; the other is shot with a high-definition digital camera; the third is shot with a film camera and then digitized into the computer hard drive. Judging from the effects of these three shooting methods, the quality of images currently shot with film cameras is much higher than the other two methods, because the resolution and color reproduction of film are far from being matched by current digital movies.

Most of the best quality ones are made with film first.

The SXRD digital movie projector is used for direct playback of film movies, with a resolution of 4090x2160, or 2160P. Since the best graphics cards and monitors today cannot support such a high resolution, it is converted to 1920x1080, or 1080P. That is 1080P high definition