Multidimensional image data processing

An apparatus for processing image data is provided, which comprises processing means , memory means , display means and manually operable input means , wherein said memory means stores said image data and instructions , said image data and said instructions configure said processing means to perform the steps of outputting said image data to said display means as a hierarchical structure of image data processing nodes to having respective hierarchical properties , said structure being configured with a dimension. In response to selecting a plurality of said nodes by way of said input means, a group node is generated having hierarchical properties processed from said respective properties. Said group node is output in said hierarchical structure . In response to selecting said group node , said dimension is reconfigured.