1. A method of decoding an encoded digital image, decodable at a plurality of predefined resolutions, comprising the steps of: selecting a resolution lower than the highest of the predefined resolutions and different from each of the predefined resolutions; determining a predefined resolution immediately above the selected resolution; determining a quantity of data of the determined predefined resolution, as a function of a ratio between a number of pixels of the selected resolution and a number of pixels of the determined predefined resolution; decoding the image including the data of the determined predefined resolution, as a function of the determined quantity of data; and subsampling the decoded image, as a function of the ratio between the selected resolution and the determined predefined resolution.