The Threshold dialog box lets you set a specific brightness value as a threshold. Pixels with brightness values above or below the threshold will display in white or black depending on the Threshold option you select. Other pixels are not affected and preserve their color. The Bi-Level option changes all pixels to either black or white (according to the position of their brightness value in relation to the threshold you set). You can also set an image-wide threshold or a threshold for a specific color channel.
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