(INFO
". Only works on 1, 2, or 3 dimensions. The window "
"over which filtering is done is always square, and "
"only a simplistic weighting scheme is available. "
"The method is cheap because it does the median "
"or mode based on a histogram, which enforces a quantization to the number "
"of bins in the histogram, which probably means a loss of precision for "
"anything except 8-bit data. Also, integral values can be recovered "
"exactly only when the number of bins is exactly min-max+1 (as reported "
"by \"unu minmax\"). ")