1. A computer-implemented method comprising: presenting a visual representation of an image object comprising information defining image data to be displayed, the image object having an associated clipping definition defining a clipped portion of the image data that is hidden from view in the visual representation while a corresponding un-clipped portion of the image data is shown in the visual representation; and during an edit operation, revealing the clipped portion of the image data by drawing the clipped portion of the image data using transparency, wherein the presenting and the revealing steps are performed by at least one computer processing device.