Open matte
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Open matte is a filming technique that involves matting out the top and bottom of the film frame in the movie projector for the widescreen theatrical release and then scanning the film without a matte for a full screen home video release. It is roughly equivalent to an uncropped version of the film.
A frame from a 35 mm film print. Here, the picture is framed for the intended theatrical aspect ratio (inside the yellow box). The picture outside of the yellow box is matted out when the film is shown in widescreen. For 4:3 television and home media versions, a large portion of the picture can be used (inside the red box) with an open matte.
Open matte example with a slight shift of the image section upwards.
Aspect ratio 2.35:1 versus 1.85:1
Widescreen
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Widescreen images are displayed within a set of aspect ratios used in film, television and computer screens. In film, a widescreen film is any film image with a width-to-height aspect ratio greater than 4:3 (1.33:1).
Widescreen in a control room
Conrad Luperti, J. Marvin Spoor, and William S. Adams with the Natural Vision camera
An early (1994) Sony Widescreen Television