It's color matching. LAB mode can be applied to color matching. In photoshop, the original photos all use RGB, that is, red, green and blue to store the color information of the file, but when calling up this color matching, you can use Lab to match the color, because L of Lab stands for lightness, A stands for red and green, and B stands for yellow and blue. It will be much more convenient to know the mixing and adjustment of colors. This picture has more cyan and magenta, but less yellow. Therefore, adjust the brightness of channel A directly in the channel panel to make it brighter, that is, increase the amount of green in the photo, and green+blue will get cyan. At the same time, the red color is based on the hue in channel A. After adjustment, the value will be reduced, and it will match the blue color in channel B to produce magenta, which is the end of adjustment. I guess you may not understand this, so I found an online tutorial to show you. /index . PHP/2009/02/ 16/4 104