A detailed introduction to Lab mode palette theory in Photoshop

This example introduces the principle of color reduction in lab mode of PS and explains in detail the application of lab pattern calculation color palette through examples.

Hope to be interested in PS palette to bring help to friends ~ ~

Now for the topic of computing, it's a big problem, and it's going to take a lot of time to make it clear, so talk about this side

You can talk about this casually.

Before you make this clear, learn what lab mode is. This pattern is not dependent on light and pigments, theoretically including human eyes can be seen

See all the color patterns. To put it simply, it is a pattern that mimics the habits of human eye view.

"The values in Lab describe all the colors that people with normal vision can see. Because Lab describes how colors are displayed, not devices such as display

, a desktop printer, or a digital camera) to generate the number of specific colors required for a color, Lab is considered a device-independent color model. "It

Is the help of the lab mode given by PS.

When people look at objects, the first thing to see is the light and shade, followed by the color, the pattern is this, a reflection of the brightness of the channel and two colors

Channel (A: dark green---50% gray (neutral gray)-Bright pink, B: bright Blue---50% gray (neutral gray)---yellow) color mode

mixed with RGB and CYMK mode to light, like brightly colored and exaggerated like in this mode down to deal with the color of the picture, in addition Lab mode

The color width is wider than the RGB and CYMK (CYMK mode is relatively narrow in three modes, and CYMK mode is mainly applied to

Printing and pigment inks are related to performance limitations.

The Brightness channel We first put aside, as the name suggests, this should be adjusted to the brightness of the photo, of course, the brightness of dark areas in the middle of the high light Zone,

How to determine, the forum has been very good tutorials, interested can go to see. Because the topic is to say the color palette, so now on the color palette to speak.

Look back at the color of the two channels: A: dark green---50% gray (neutral gray)-Bright pink, B: bright Blue---50% gray (neutral gray)---yellow.

In these two passages we also see the presence of ash, which many people actually see. Determine the center point from the palette in lab in each forum

See this, how to use this if the copy is not what it means. Put it aside first. But with this we can choose from Lab mode

The main color, from the AB channel we can see intuitively, lighter than the gray is bright magenta and yellow, darker than the dark green and bright blue.

If you're just trying to get a color fixed, just create a selection for that color and simply fix it with hue and saturation.

It's OK. How to choose to adjust the color, using 50% gray (neutral gray) can choose the color, this is a yardstick.

We know that if there is no mixing mode involved in the calculation, no mixture can be carried out, water is water, sand is sand.

We know that the darkening blending mode has one feature: "Select the darker color in the base color or blend color as the result color." pixels lighter than the blend color are replaced,

pixels darker than the blend color remain unchanged. "It's also a feature of his relative brightening blending mode:" Select the lighter color of the base or blend color as

As the result color. pixels darker than the blend color are replaced, and pixels that are brighter than the blend color remain unchanged. "Using the characteristics of these two modes, we can light

Choose the main color of the AB channel.

First, let's look at channel A. Know from the concept of lab mode, a: dark green---50% gray (neutral gray)--bright pink. In the grayscale diagram of this channel,

Dark indicates green: less than 128 gray or 50% gray to green, gray value is nearly 50% gray, the green saturation is smaller, the farther the gray value is less than 50% gray,

The higher the saturation of the green, the brighter the bright pink is than 128 degrees (or 50% gray (neutral gray)) The bright part shows the red portion of the picture, the brighter the

The higher the saturation, conversely, the closer to the neutral gray (darker light region) the more the value of 128 degrees of gray, the less saturation.

B channel shows from the bright Blue---50% gray (neutral gray)---yellow, the bright area of the channel grayscale is yellow area, the higher the brightness, the higher the saturation,

The nearer 50% neutral ash, the lower the saturation, the darker part of the channel grayscale is the yellow area, the darker the display area, the higher the saturation, the nearer 50%

Neutral Ash, the lower the blue saturation. Here is a hint that using the dimming mode group and the dimming mode group can be mixed by calculation or application of the image

Channel replacement channel value can be used to color, the way there is a lot of color, according to everyone's favorite, there are different, of course, you can also use the superposition mode

Type to change the value to see what the effect appears. There's always something to be found.

Here is an example of an adjustment in a channel, the blue sky processing into a sky you can imitate this in the B channel to do, of course, you can also through direct

To create a new channel and then replace the original channel to achieve your goal.

Now let's use an example to illustrate the application of the lab pattern calculation palette.

PS Tutorial Artwork:

Create a new channel, fill in 50% gray

Choose bright pink, and the result color we see is a grayscale chart with 128 gray colors, which is replaced with 128 gray in areas darker than the blend color, and is reserved for bright pink areas that are brighter than the blend color.

Select Red Area