1. A computer-implemented process for allowing a viewer to interact with a displayed image so as to cause the displayed image to change with regard to a desired effect, comprising: an accessing step for accessing an interactive image, said interactive image comprising a set of representative images which depict a scene with one or more image parameters varying between images; an inputting step for inputting an interaction mode selection made by the viewer; an implementing step for implementing the mode of interaction by displaying one of said representative images, or a modified version thereof, on the image display device in accordance with requirements of the selected mode of interaction.