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%
% BlackThresholdImage() is like ThresholdImage() but forces all pixels below
-% the threshold into black while leaving all pixels above the threshold
+% the threshold into black while leaving all pixels at or above the threshold
% unchanged.
%
% The format of the BlackThresholdImage method is:
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%
% WhiteThresholdImage() is like ThresholdImage() but forces all pixels above
-% the threshold into white while leaving all pixels below the threshold
+% the threshold into white while leaving all pixels at or below the threshold
% unchanged.
%
% The format of the WhiteThresholdImage method is: