PS: What is the difference between the mask and the channel?

PS: What is the difference between the mask and the channel?

Here we can use the concept of the mask to help understand the meaning of the channel, the usual masking can be seen as this: when you select a portion of the image on the PS image using the selection tool, the gray-black part of the selection is the mask, where you can't manipulate it in the next step, which is equivalent to a dark glass. A few of the pieces that you can penetrate on the glass are your constituency.

So how do you understand the passage?

Photoshop's idea of creating a channel is ingenious. As we all know, all the colors around us are expressed in computer language is RGB color value, it uses the color principle will red, green, blue Three colors from the dark to bright from 0 degrees divided to 255 degrees a total of 256 grades, the human eye can hardly tell the difference between 185 degrees blue and 184 degrees of blue, This is a way to make people's images difficult to describe the color difference in order to accurately express the value of the method, we use PS for image processing is naturally to follow the rules of the computer.

The role of the channel is to "mask" the way to deal with image color, for example, this is an image opened by PS, did not make any settings:

We have selected the "channel" of all eyes, to see the image from the "Red", "green", "blue" three colors combined from the full image color.

And when only the red column of the "Eyes", we entered the "Red channel", the entire image has become black and white.

What the hell is going on here? The original is Photoshop shielded green color and blue color expression, as the image file with only the red color, then the image does not show as crimson, pink and other colors? Photoshop here is actually suffering from "color blindness", into the only "red" world. The darker part of the original image is whiter, whereas it is black.

In the same way, we can know that the radio "green" or "blue" eyes enter the "green channel" or "Blue channel".

What if two channels are selected at the same time? The following figure, we selected red and green two eyes.

Photoshop filters out the blue part of the image, showing red, green, and yellow color gamut synthesized by red and green, and the image becomes brighter.

Now do you understand the meaning of the passage?

The mask is selected to edit the visible parts of the picture outside itself, and the channel is to edit the color expression inside the image. By using the concept of channel, people can make changes to the color of the image more intuitively, and it will not affect the expression of colors in other channels.

It is noteworthy that: using RGB color Mode We can choose three spot color channels (color algorithm), and when you use the print mode of CMYK will have four spot color channel (subtractive algorithm).

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