说明：  三个图像处理小程序：一、将RGB空间转换到HSI空间。二、将24位位图转换为8位位图。三、将8位位图转换为24位位图
(3 Image Processing applet: First, the RGB space converted to HSI space. Second, the 24-bit bitmap is converted to 8-bit bitmap. Third, the 8-bit map is converted to 24-bit bitmap)