An apparatus for generating an image comprises a receiver (101) which receives 3D image data providing an incomplete representation of a scene. A view vector source (103) provides a rendering view vector indicative of a rendering viewpoint for the image. A renderer (105) renders a first region of an intermediate image for the rendering view vector based on image data from the 3D image data. An extrapolator (107) extrapolates the 3D image data into a second adjoining region of the intermediate image with the 3D image not comprising image data for the second region. A blur processor (109) generates the image in response to applying a spatially varying blurring to the intermediate image where a degree of blurring is higher in a transitional region between the first region and the second region than in an internal area of the first region.