How to use the calculation of PS

Second, the operation steps:

1. Open the picture; Select File-Open command, and select a picture in the pop-up open dialog box. As shown in the figure below.

2. Copy the channel; Open the channel panel, select clean "green" and drag it to "New Channel" at the bottom of the channel. As shown in the figure below.

3. Gao Fancha keeps the filter; Filter-Other-Keep Gao Fancha, set relevant parameters, and click OK after setting. As shown in the figure below.

4. Set the calculation command; Select Image-Calculate and set relevant parameters in the pop-up dialog box. As shown in the figure below.

5. Calculate the effect of the command; After setting, click OK to generate the "Alpha 1" channel layer. As shown in the figure below.

6. Calculate the command; Continue to repeat the calculation command twice to get "Alpha 2" channel and "Alpha 3" channel. As shown in the figure below.

7. constituency reverse election; Hold down Ctrl, click above the thumbnail of the "Alpha 1" channel, load the selection, and press Ctrl+shift+I to deselect the selection. As shown in the figure below.

8. Adjust the curve; Switch to the layer panel and press the shortcut key Ctrl+M to pop up the curve dialog box and adjust the parameters. As shown in the figure below.

9. The final effect; Click OK after setting, and press Ctrl+D to cancel the selection. Get the final effect after adjustment. As shown in the figure below.