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Make a banded grayscale with in units of .band. pixel values each.
Thus, pixel values 0 to (.band. - 1) on the image will map to 0, while
values from .band. to (2 * .band. - 1) will map to .band., etc.  For
example, .band. = 2 gives grayscale = (0 0 2 2 4 4 6 6 ... 252 252 254
254).
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