What is Lab in PS?

#lab color model is based on human perception of color. The values ​​in Lab describe all the colors that a person with normal vision can see.

Lab color model is composed of three elements: brightness (L) and color-related a and b. L represents Luminosity, a represents the range from magenta to green, and b represents the range from yellow to blue.

Using lab in PS is for color grading

Lab color mode conversion method:

When you face an RGB Or CMYK images need to be converted to LAB color mode, just execute "Image - Mode - Lab Color".

In PS, when you convert the RGB mode to CMYK mode, PS will automatically convert the RGB mode to Lab mode and then to CMYK mode.

In terms of expressing color range, the first place is Lab mode, the second place is RGB mode, and the third place is CMYK mode.

lab color correction can adjust light, shade and color information independently.

Lab mode has three channels: L brightness channel and two color channels a and b.

Lab mode stores light, shade and color data information in different locations. Modifying the brightness of the image will not affect the color of the image, and adjusting the color of the image will not destroy the brightness of the image. This is what Lab mode adjusts. The greatest advantage in color.

If you only adjust the brightness and clarity, just adjust the L channel.

The A and B channels are responsible for color information, that is, just select the A and B channels to adjust the color information.

Lab color mode channel grading is the only mode that can adjust light, shade and color information separately.

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