ISO 2907:2002 specifies the maximum dimensions of the film image area intended for projection from a 35 mm motion-picture film and the position of this area relative to the perforations and the reference edge of the film.
ISO 2907:2002 specifies three types of image areas intended for theatrical projection:
Style A: general theatrical release prints commonly referred to as non-anamorphic or wide screen;
Style B: theatrical release prints with an anamorphic image;
Style C: classic theatrical prints.