Using Photoshop Channel Mixer to Extract Dense Tree Pictures Tutorial
Today brings new knowledge points——passagewayMixer. The Channel Mixer modifies the target color channel using a blend of existing color channels in the image. Use the Channel Mixer to create high-quality grayscale images, sepia tones, or other color images.
1、 Channel mixer
A. Create Channel Mixer
There are two ways to create the Channel Mixer:
1. [Image] – [Adjust] – [Channel Mixer], [Note]: This method will modify the image data.
2. Created by adjusting layers. Click the Create New Adjustment Layer button in the Layers panel, and select Channel Mixer in the open drop-down list to create an adjustment layer and open the Channel Mixer dialog box.
B. Parameter interpretation
The channel mixer dialog box is shown in the following figure:
1. There is an “Output Channel” option in the dialog box, which refers to the channel we want to adjust. For RGB mode images, red, green and blue channels can be selected;
2. After selecting an output channel, the slider of this channel will be automatically set to 100%, and other channels will be set to 0%;
3. Move the slider of the channel to the right to increase the percentage of the channel in the output channel, and drag to the left to decrease the percentage.
The following figure shows the image effect when the red channel is 100% by default.
Modify the value of the red channel to 200%, and increase the percentage of this channel in the output channel. After the red channel becomes bright, the red color in the image is enhanced and the range is expanded.
4. When the “Monochrome” option is checked, the image will become black and whiteMattingFrequently used in;
5. The Constant option is used to adjust the grayscale value of the output channel.
a) For RGB mode images, when the value is positive, more white can be added, and when the value is negative, more black can be added;
b) When the value is+200%, the output channel is all white;
c) When the value is – 200%, the output channel is completely black