Defines the coding principles to be used in interchanging pictures consisting of graphic images in a 7-bit or 8-bit environment; the data structures to be used to represent the primitives describing a picture; the general datatypes which can be used as operands within a primitive. Does not deal with the presentation semantics of pictures. These are defined in the related International Standards. Applies to the data streams containing data structured in accordance with picture coding methods defined in ISO 9281.