1. An image decoder comprising: a motion compensation stage; a gamut transformation unit upstream from the motion compensation stage, the gamut transformation unit configured to modify pixel values in image data being decoded; a frequency domain to spatial domain converter, wherein the gamut transformation unit is configured to modify pixel values in regions outputted by the frequency domain to spatial domain converter; and first and second parallel decoding pipelines upstream from the motion compensation stage wherein the gamut transformation unit is configured to modify values in regions in the second decoding pipeline, wherein the second decoding pipeline is connected to decode a difference signal representing a difference between a first video signal processed by the first decoding pipeline and a second video signal and the image decoder comprises a combining stage configured to receive and combine the difference signal and the first video signal to yield the second video signal.