A method of image processing using neural networks. Images to be processed and displayed are received. Each image is divided into sections, each comprising pixels represented by color values. A neural network training procedure is executed for the sections to obtain color value tables and mapping tables. Each color value table comprises colors represented by the color values. The mapping tables record the relations between each pixel and the colors in the color value tables. The color value tables and the mapping tables are recorded in an electronic device for image display.