| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration in picture quality even in the case of displaying with various application programs by mapping from the color data of (a) bits to a color set in a color palette and gradation-reducing to the color data of (m) bits equal to or smaller than (a) bits. SOLUTION: In the case of an index color mode, a display of an image reads out successively the index pixel data stored in a frame buffer 141, and converts the index pixel data to the RGB data by the color palette 132 to send them to a DAC 133. A CPU 11 converts the image data to the color data of (a) bits, and selects a pixel conversion filter 112 long in processing time in the case of displaying a still image, and selects the pixel conversion filter 112 short in processing time in the case of displaying an animation. Then, the CPU 11 maps from the color data of (a) bits to the color set in the color palette 132, and gradation-reduces to the color data of (m) bits equal to or smaller than (a) bits. |
