The present invention provides an approach for generating a blended image from plural image layers in accordance with at least one alpha -layer being assigned to one of the plural image layers. In accordance with the alpha -layer, a transparency of image areas of the assigned image layer is indicated. The alpha -layer includes a pointer associated with an image area of the assigned image layer. Amemory stores a transparency table including a plurality of transparency values at particular memory addresses. The pointer refers to an address of the memory storing the transparency table in order to assign a transparency value to the image area.