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How to adjust the color scale of PS? Can you tell me some different operation methods?

The first kind:

1. The easiest way to adjust the photoshop color scale is to click Auto directly in the color scale, and then Photoshop will automatically analyze the photo information and adjust it automatically.

The second type:

1. Select the eyedropper tool to set the black area in the color scale, and then click the darkest place in the photo.

2. Select the eyedropper tool to set the white area in the color scale, and then click the brightest place in the photo.

3. At this point, the adjustment of photoshop color scale is completed, and the role of photoshop color scale is self-evident.