Abstract: Colors of plural pictures are defined by using color pallet data. Predetermined digital data are stored in a memory. The color pallet data are converted to the corresponding digital data stored in the memory. The memory contents are addressed by using an offset address (relative address) established for each picture.

Abstract: In an image processing apparatus, a plurality of different images are displayed simultaneously on a display screen. According to a first feature, a priority circuit determines a display order of images for each dot, the images being supplied from a variety of image generators. In accordance with the priority order, the images are displayed on a screen. According to a second feature, an image processing apparatus includes a register for specifying a key area to be displayed as being transparent. A plurality of images are synthesized in accordance with the data held in the register. According to a third feature, a video display processor (VDP) processes color data of an image to be displayed, and a video encoder unit synthesizes a plurality of images in a predetermined order of a display priority by a cellophane function. The cellophane function is controlled to be turned on and off for each unit of a predetermined data block.