1 and Lab are lightness channels, and A, (genuine red negative green) and B (positive yellow negative blue) are color channels.

That is to say, Lab lightness and color are separated. You can adjust the contrast of the picture in L and adjust the color in channels A and B..

2.RGB three channels contain brightness information and color information at the same time, so it is difficult to control the color by adjusting the contrast in RGB. Adjusting the colors in RGB will make the contrast difficult to control.

Second, the adjustment methods are different.

1, Lab color matching: light and shade and color can be adjusted separately.

2.RGB needs three-color adjustment, which is more complicated.

Third, the color gamut is different

1. Wide color gamut: Because the color gamut of LAB color mode is the widest, the image in RGB or CMYK color mode will be converted into LAB color mode without losing any color information.

2、? RGB mode is the physical color mode of the display. ? No matter what color mode is used in the software, the image will eventually appear in RGB mode as long as it is displayed on the display.

The above is the most significant difference between the two color spaces. Another difference is that the color gamut of LAB is wider than that of RGB. That is to say, if the colors adjusted in Lab are beyond the color range of RGB, the extra colors will not be restored after being transferred back to RGB space, and the details will be lost.

4. We can know the difference between the two colors.

The unique advantage of 1 and LAB lies in the emphasis on color change.

2. The unique advantage of 2.RGB lies in mixing channels, or supplementing details or adjusting colors.

All we have to do is to choose the right space and the right tool for the right image at the right time.

Extended materials:

What do H, S, B, R, G, L, A, B, C, M, Y and K stand for in photoshop color picker?

1, h hue;

2.s saturation;

3.b brightness;

B is not the absolute value of brightness, but a relative value, that is, relative brightness, expressed as a percentage. Brightness varies from 0% to 100%: 0% represents black; 100% stands for white.

4.l stands for brightness, ranging from 0 ~100;

5. Component A represents the spectral change from green to red. A is positive, indicating that the color is red, and a is negative, indicating that the color is green. Values range from+128 to-128. In the Photoshop palette, the range of values can be+120 to-120;

6. Component b indicates the spectral change from blue to yellow, positive B indicates that the color is yellow, and negative B indicates that the color is blue. Values range from+128 to-128. In the Photoshop palette, the range of values can be+120 to-120;

7, R red;

8.g stands for green;

9, b stands for blue;

10, c stands for cyan;

1 1, where m stands for magenta;

12, y stands for yellow;

13, k stands for black.