An image processing system computes blended pixel data from two image layers and α-layer data. α-layer data indicates a transparency of one of the image layers. The image processing system includes more than one memory capable of storing pixel data. A processor is programmed to apply different processing methods to pixel data based on their storage locations. A selector may obtain pixel data from each image layer and the α-layer data. The selector may transmit the pixel data to one of the multiple memories based on the α-layer data.