Using this compression method,we can not only fulfill the compression from RGB color gamut to CMYK color gamut and keep the most colors in the gamut invariable,but ensure the number of gray levels in the compressed image area.

• 用此种方法不仅能将超色域颜色压缩到目标设备的色域内 ,使色域内大部分颜色保持不变 ,而且能保证被压缩图像部分的灰色级不受损失 ;