1. Method of processing a compressed image into a color gamut mapped decompressed image, comprising the steps of: entropy decoding the said compressed image into a plurality of adjacent compression block areas, dequantizing each compressed-block area so as to provide a spatial frequency distribution of color values of pixels of said image within each compression block area, inverse-transforming the spatial frequency distribution of each block area into color values for each pixel of said compression block area, for each compression block area, selecting one of a plurality of color gamut mapping algorithms according to the spatial frequency distribution of color values within said compression block area, gamut mapping color values of each compression block area of said image using the color gamut mapping algorithm selected for said block area, so as to provide said color gamut mapped decompressed image.