Photoshop detailed resolution of the main color selection method

One, high light area

The first method: "Menu-image-Calculation" is shown in the following figure: Gray channel multiply bottom calculation.

Get the alpha channel, press CTRL and click the alpha channel to load the selection,

Principle:

The definition of a positive stack in PS: Multiply the base color and the blend color. The result color is always the darker color. Any color and black multiply the bottom to produce black. Any color with a white positive overlay remains unchanged.

In other words, gray and Gray in the calculation of the multiply, the middle of the image to the darkened part of the new channel will become darker, in the dark gray to the black part of the display. Only the original High-profile part can get gray to white display. In this way, the result channel can be loaded into a constituency to get a high light constituency.

The second method: common practice, press CTRL and click on the RGB channel or ctrl+alt+~ (the shortcut keys vary by version) to get a selection.

This is a common selection procedure for skin whitening. The general whitening method of the following figure: Fill white After making selection, adjust opacity or mix style, achieve simple whitening effect.

It is clear that the two methods of selecting the high light have different selection ranges. Look at the picture below:

The first method range is significantly less than the second method. If the second method is evaluated again, the following figure:

CTRL + click on the RGB Channel or ctrl+alt+~ (shortcut keys vary depending on the version), as in figure one into the channel panel, choose to convert the selection to the channel. Get the ALPH1 channel of Figure two. Then the ALPH1 channel is calculated and the ALPH2 channel is obtained. As shown in Figure three.

The resulting ALPHA2 channel, when loaded into the selection, will find that this result is the same as the first method.

Therefore, the strict Gaoguang method is the first method. But according to the different film and the goal, may choose the application flexibly.

　　Second, the middle area of adjustment.

The first method: "Menu-image-Calculation", as shown in the following figure ash and gray inverse channel calculation, mixed mode multiply the bottom. Get the alpha channel.

You can see that the alpha channel character's skin is illuminated with other areas, which is exactly what we want, the midtones.

Principle: The grayscale inversion of the channel shows the black color of the original image as white, white is black, that is to say that grayscale and its reverse phase in the calculation of the multiply, the image of the highlights and darkened parts in the new channel are in the dark gray to the black part of the display, only the original middle tune to get gray to white display. This way the result channel is loaded into the constituency to get the middle-tuned constituency.

If you load this selection, the following warning will pop up, regardless of the edge of the selection, although there is no ant line, but the constituency has been established.

This selection can be used to color the skin of the character, but it will have less effect on other regions.

For the color of the skin of the general use of a lot of "optional color, hue saturation, color levels" and other tools.

As illustrated in the illustration

The second method: "Menu-image-Calculation" below the figure gray Channel calculation, mixed mode exclusion.

This method gets a bigger and softer selection than the first.

Excluded definitions in PS: Create an effect that is similar to the "difference" pattern but has a lower contrast. Blending with white reverses the value of the base color. Blending with black does not change.

However, because the gray scale is also dimmed during the calculation of the positive stack, the selected midtones are narrower than the exclusion mode.

The difference can also be seen in the channel shading obtained by two methods.

Third, dark part of the region

The "menu-image-Compute" figure is computed in the gray inverse and the gray inverse channel, and the blending mode is multiply. Get the alpha channel.

The above inference is the same way that the high light and midtones will become dark gray to black, only the original dark parts can be gray to white display.

This way the result channel is loaded into the constituency to get the dark part of the constituency.

You can, of course, multiply the resulting alpha1 selections to get a smaller range of dark selections. The following figure.

Depending on the purpose can also be used in other channels or mixed mode to calculate, I think the choice of high school low-key should not be called the standard answer, according to the need to choose,

It is the right thing to achieve the desired purpose. We can try.

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