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pix-threshold-to-value pix-d pix-s threshold set-valueprocedure

If pix-d is #f, returns a pointer to a new pix. Else, pix-d must be equal to pix-s and thresholding is done in place. If set-value > threshold, then all pixels with a value >= threshold are set to set-value; else, if set-value < threshold, then all pixels with value <= threshold are set to set-value.