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When a large region of data is displayed as an image there is an upper
limit of the maximum number of pixels to be output by the
graphics system to a PostScript file. If necessary, prior to
display, the region is automatically re-binned to a smaller size. The
data is re-binned by an equal factor in both directions, and scaled by
the number of re-binned pixels, so the range is approximately the same as
the range of the full data. This both reduces image file size, and
makes printing faster.
The upper limit may changed by the user, so that higher or lower resolution images may be printed.