Official releases are 2.40:1 . Any version filling your entire 16:9 TV without stretching is likely an Open Matte fan edit or a rare HDTV broadcast rip.
The Director’s Cut restores the subplot of Hollis Mason’s (the original Nite Owl) death and adds crucial texture to the violence. The Open Matte format amplifies these moments. When Rorschach utters, "I’m not locked in here with you...", the expanded frame gives his spartan prison cell a suffocating verticality that the cropped version loses.
Watchmen (2009) Director’s Cut Open Matte refers to a specific viewing format that expands the standard widescreen image to fill a 16:9 screen by revealing information previously hidden by letterboxing. Versions Comparison Theatrical Cut (162 mins): The standard version released in cinemas. Director's Cut (186 mins):
But the collectors know the truth. The open matte reveals the architecture of failure and heroism that Snyder built. Until the studio officially revisits the master elements, this "exclusive" 1080p hybrid remains the definitive edition—a secret handshake for those who refuse to let the black bars steal one frame of Rorschach’s mask.