How does ps perform selective subtraction?

Tool: pscs6

1. First, drag the image to be processed directly into ps, as shown in the figure.

2. After dragging in, you need to edit. As shown in the figure, click the quick selection tool in the left menu bar.

3. Then start selecting the yellow and red areas above the graph, as shown in the figure.

4. Finally, you need to cooperate and then hold down the shortcut key Alt, the cursor will become a minus sign, and then the mouse will start to drag and subtract the selection.

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