中文说明：为了避免直接对rgb图像处理时出现颜色失真，常把彩色图像由rgb空间转为hsv空间，完成相应处理后，再逆变换至rgb空间。
English Description：
In order to avoid color distortion when processing RGB image directly, the color image is often transformed from RGB space to HSV space, and then inversely transformed to RGB space after corresponding processing.