Patent ID: 7209144

Claim:
An image-display apparatus, comprising: an image display that can display n-bit gray scales; an image-data obtaining device that obtains m-bit image data to be displayed, all obtained image data being from a same image and having a same resolution; a bit-number decreasing device that decreases a number of bits of the image data from m to n; an interpolation device that interpolates a predetermined number of gray scales for the n-bit image data by performing a dither process and generating interpolation image data having a predetermined number of gray scales corresponding to the m bits; and a display control device that displays the interpolation image data on the image display, the interpolation device performing the dither process by using a second dither matrix, where a gray-scale value of the m-bit image data corresponds to a predetermined area, and performing the dither process by using a first dither matrix, where the gray-scale value does not correspond to the predetermined area; and the interpolation device performing the dither process by using the second dither matrix only for image data having a predetermined gray-scale value of the m-bit image data.