Beside the layers panel is another panel Channels. Its purpose is to graphically display color information. Each channel is a single component image.
So, what exactly is the point of this panel?
First, the color channels are divided by color. For example, in RGB mode the image is divided into 3 channels: red, green, blue, and CMYK is 4 channels: cyan, magenta, yellow, black. Thus, it is possible to highlight the fact that Photoshop does not distinguish the color, and finds it by filtering through a channel overlay each other.
Second, there are also alpha channels. Like the color channels, they support 256, 65536, 4 294 967 296 shades of gray. But unlike the color channels, do not contain information and represent the levels of opacity masks. They can be used as selection, with subsequent retention (information about alpha channels is entered into the program, so the cost is the memory, in consequence of which increases the size of the original file).
Let us consider in more detail using channels in Photoshop for example.
Go to the Channels panel – Window-Channels . See a panel like Layers, just as layers are the channels depending on the display mode. We will use the RGB mode.
Here you can see 3 separate channels and 1 common:
RGB composite channel, consisting of:
Red – red, green – Blue, green – blue color.
If we make a selection and save it, then we will have 4 channel: alpha channel. As you remember, this is a simple selection.
Now let’s see what are the channels for individual colors and find out how to use them. So, red, green and blue channels in the order presented below.
You may notice that the white color in the channel corresponds to red when viewed in RGB mode. Ie if you take the tool Eyedropper Tool the color of the hood of the car, then going to the bar Window-Color see that red has a value of 255. Since we have red and pink color, green and blue values in the panel Color will change.
Left to right menu panel Channels the points:
New Spot Channel
Merge Spot Channel
Close Tab Group