6-7 Automatic and black grey field

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Color scale also belongs to Photoshop's basic adjustment tool

Images > Adjustments > Levels "〖ctrl l〗

The curve in the middle of the adjustment can arbitrarily increase the control point, color scale does not

The output levels below are the highest and lowest luminance values in the control image. If you move the white arrow to 200, the brightest pixel in the image is 200 brightness. If you move the black arrow to 60, it means that the darkest pixel in the image is 60 brightness.

6-7 Automatic and black grey field