1. A method of processing digital image data performed by an apparatus for processing digital image data, the method comprising: processing, at a processor of said apparatus for processing digital image data, said digital image data based on multi rate signal processing, multi resolution signal processing and/or multi scale signal processing to enhance sharpness properties, wherein said processing includes decomposing and reconstructing said digital image data, and said decomposing includes: performing a process of decimation, performing a process of interpolation/integration based on an output of said process of decimation, performing a process of detecting and enhancing edges, and generating a detail signal depending on an output of said process of detecting and enhancing edges and on an output of said process of interpolation/integration, and said reconstructing includes using said detail signal as an input.