Standard Blu-ray releases present the film in 2.35:1 or 2.39:1 (Scope aspect ratio). However, the film was shot on Super 35mm film, which captures a much taller image natively. This brings us to the core of your search. The term Open Matte refers to a version of a film where the studio does not crop the top and bottom of the Super 35mm frame to fit a widescreen cinema scope. Instead, they "open" the matte (the black bars) to reveal more picture information.
It is a technical unicorn. Does it exist? In underground fan-editing circles, yes—versions like Titanic: The Open Matte Reconstruction circulate. However, acquiring it requires navigating the dark corners of the internet at your own legal and cyber-security risk.
Happy hunting—but stay legal, and stay safe.
