Principle and calculation of Photoshop channel mixer

Before learning the Photoshop channel mixer, we must understand the composition of the color and the principle of the channel.

In the color system, "red + green = yellow", "red + blue = Pinkco" "Blue + green = Cyan". In the display is in RGB mode, RGB three values are 255 display as white, RGB three values are 0 display black. Any image in the channel inside is a gray-scale, white on behalf of the full selection, the black represents a complete choice, gray representative part of the selection, the concept of the next channel mixer and gradient map to create a selection inside is important. Understanding these, using the channel mixer to pull the map is no longer difficult to the sky.

This is the original image:

Original

Click on the Photoshop Layers panel to select the channel mixer by creating a new fill layer and adjusting the layer button.

Select Channel Mixer

Select the green channel from the output channel

Select Green Channel

Select the blue channel from the output channel

Select Blue Channel

In the channel mixer inside the output channel is the channel we want to change, the source channel inside the red, green, blue channel value is that we modify the output channel is participating in the channel value, the Mobile Source Channel slider button does not change the original channel gray value. We see above three figure, the output channel inside is red, the source channel inside the red channel value is 100%, the output channel inside is green, the source channel inside green channel value is 100%, the output channel inside is blue, the source channel inside blue channel inside the value is 100%. This is what we just said the projection of the display, if the source channel inside the three-color value slider all moved to 0, the display of the image is black!