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The threshold in PS is actually a black-and-white dividing value based on the brightness of the picture, which is a conversion critical point. Thresholding an image is a method of applying special processing to colors.
The default value of the threshold is generally 50% neutral gray, that is, 128. The brightness higher than 128 (<50% gray) will turn white, and the brightness lower than 128 (>50% gray) will turn white. ) will turn black. You can set the threshold yourself.
The function of the threshold is that no matter what color your picture is, it will eventually turn it into a black and white picture with different contrast.
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