There is provided a method of encapsulating an encoded bitstream representing one or more images, the encapsulated bitstream comprising a data part and a metadata part. The method comprises: - providing image item information identifying a portion of the data part representing a sub-imageor an image of a single image and/ or a set of single images; - providing image description information comprising parameters including display parameters and/or transformation operators relating to one or more images and - outputting said bitstream together with said provided information as an encapsulated data file. Said image item information comprises one or more properties including at least part of the image description information dedicated to the considered sub-image or single image or set of single images, said image description information being defined in one or more boxes.
