How to use lab colors for authoring

What is Lab color

Lab mode is based on a Commission Internationale de L ' Eclairage (CIE) established in 1931, an international standard for the determination of color, improved in 1976, and named a color pattern and color space. is an alternative color mode other than the RGB and CMYK color modes.

Compared to RGB and CMYK two modes, Lab's function is not available in the other two color modes, and lab mode has the advantage of three aspects: 1. Based on the human eye, the gamut is widest; 2. Non-destructive, extremely fast handling; 3. Black and white color, channel separation.

After familiar with the composition and working principle of lab color channel, we can create the artistic color palette of the photo.

In practice, the rendering and hardening of colors in the screen is often done through multiple lab channel palette and layer drawing overlay. Therefore, the use of lab to color the art of the image processing no fixed rules, visual and color feelings vary from person to person, the shadow friend in concrete practice can also be through more attempts to choose the most suitable for the film's color effect.

The following picture shows a variety of tonal effects that are processed by "reverse-phase" and "tonal-homogenization" of the lab's channels, based on the original image. If the layers are combined with blending mode and brush tool, the change will be infinite.

Original film

Flowers taken on a white background.

Inverse of all lab channels

This adjustment produces an interesting effect opposite the color value of the base image.

Reverse phase of L Channel

Turn the white image black or turn the black image white.

Adds a color to the image that is the opposite of the green/magenta main hue.

Reverse Phase a channel

Adds a color to the image that is the opposite of the blue/yellow main hue.

Reverse phase of B Channel

Increase the contrast and special effects of the image, which is suitable for the basis of the new image.

Tonal homogenization of L channels

Add green and magenta to the image.

Tonal homogenization of a channel

Tonal homogenization of B channels

Add blue and yellow to the image.

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• PS Palette Tutorial