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scalerange(image, logrey, higrey [, low,
high][, /fullrange, /zoom])
Returns a linearly intensity-scaled version of image. The
lowest data value, or low if that is specified, is mapped
to a relative grey level of logrey, and the highest data
value, or high if that is specified, is mapped to a relative grey
level of higrey. By default, a relative grey level of 0
corresponds to color index !scalemin (commonly black) and a
relative grey level of 1 to color index !scalemax (commonly
white). If /fullrange is specified, then 0 and one less than the
maximum number of color cells for the currently selected display type
are used instead of !scalemin and !scalemax. If x windows
are not used, then the range is 0 through 255.
If /zoom is specified, then the values of !zoomlow and
!zoomhigh are used instead of low and
high.