This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A process of creating a black-and-white image out of a grayscale image consisting of setting exactly those pixels to white whose value is above a given threshold, setting the other pixels to black.

"With the blessing of the new Antiquities Authority president, Khalifa oversaw the entire process, including the technical side which included such things as edge detection, document degradation, global and adaptive thresholding, color clustering, and image processing."

thresholding    thresholds   

edge    bound    boundary    sill    commencement   

border    beginning    stimulus threshold    absolute threshold of difference    dweller on the threshold   

thresholdless    thresholdlike    thresholding   

gate    door    outset    sill    groundsel   

doorway    confine    limit    level    boundary