STEP

THE BOX'S MAIN HELP:

This function returns 0, black or (0,0,0) if B < A.
This function returns 1, white or (1,1,1) if B >= A.

A (input):

This is the threshold value.  It must be a scalar, color or point,
but A and B must be the same data type.

B (input):

This is the test value,  It may be a scalar, color or point,
but A and B must be the same data type.

OUT (output):

This function returns 0, black or (0,0,0) if B < A.
This function returns 1, white or (1,1,1) if B >= A.