The color palette includes a plurality of entries (256 pieces in FIG. 5) (that is, color palette data), and each of the plurality of entries includes a color number (0 to 255 in FIG. 5) and an RGB value that is display color data, i.e., red (R), green (G) and blue (B) values. In the example shown in FIG. 5, the color number is a numerical value from 0 to 255, and the color number is used to designate the color of a pixel of display component data. The number of color numbers is not limited to 256 and can be any other number.
The display color data corresponding to the color number are 24-bit full-color data that indicate the color used when the pixel constituting the color component image displayed in the image display unit 11 is displayed. The 24-bit full-color data are data combining 8-bit R-color data, 8-bit G-color data, and 8-bit B-color data.
In FIG. 5, the first entry in the color palette of a table structure is the entry of color number 0 and indicates the background color of the color component image. In FIG. 5, the entry of color number 1 and subsequent entries indicate the color of the numeral or character of the color component image, the color of shade, the color of the border, and the like and can be decided arbitrarily when the color component image is structured. FIG. 5 shows a color palette being data of a tint in a red range (including colors in a green range), and the tint of the color palette is changed by a user operation.
