1. A method for processing digital images or video signals, the method comprising: providing a first dynamic range digital image or video signal; processing the first dynamic range digital image or video signal to obtain a second dynamic range digital image or video signal having a dynamic range lower than the dynamic range of the first dynamic range image or video signal; encoding the second dynamic range digital image or video signal; decoding the encoded second dynamic range digital image or video signal; and normalizing the decoded second dynamic range digital image or video signal, generating a set of normalization parameters of the first dynamic range image or video signal with respect to the decoded second dynamic range image, thus obtaining a set of normalization parameters.