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LS

LS

Name


      LS

Purpose


      Scale image between percentiles 1 and 99 (or specified percentiles).

Category


Calling Sequence


      out = ls(in, [l, u, alo, ahi])

Inputs


      in = input image. in
      l = lower percentile to ignore (def = 1). in
      u = upper percentile to ignore (def = 1). in

Keyword Parameters


Keywords


        SCALE_ON=arr Array to determine scaling on. If not
          given then input image in is used. As a special case
          may give a 2 element array: [lo,hi] to scale to 0, 255.
        TOP=t Max byte value for scaling (def=!d.table_size-1).
        /QUIET Inhibit scaling message.
        NBINS=nb Number of histogram bins to use (def=2000).
        /NOSCALE Do not actually scale the data (returns 0).

Outputs


      alo = value scaled to 0. out
      ahi = value scaled to 255. out
      out = scaled image. out

Common Blocks


Notes


      Notes: Uses cumulative histogram.

Modification History


      Johns Hopkins University Applied Physics Laboratory.
      R. Sterner. 7 Oct, 1987.
      RES 5 Aug, 1988 --- added lower and upper limits.
      R. Sterner, 1995 Dec 15 --- Added SCALE_ON keyword.
      R. Sterner, 1998 Jan 15 --- Dropped use of !d.n_colors.
      R. Sterner, 1999 Sep 15 --- Added /NOSCALE.
      R. Sterner, 2002 May 22 --- SCALE_ON may be [min,max].
      R. Sterner, 2003 Feb 04 --- Listed value for constant image.
      R. Sterner, 2003 Jun 27 --- More histogram bins.
      R. Sterner, 2003 Jul 08 --- NBINS keyword.
      R. Sterner, 2010 Jun 04 --- Converted arrays from () to [].
      R. Sterner, 2011 Dec 08 --- Added ERROR=err. alo,ahi=-1 for constant.
  Copyright (C) 1987, Johns Hopkins University/Applied Physics Laboratory
  This software may be used, copied, or redistributed as long as it is not
  sold and this copyright notice is reproduced on each copy made. This
  routine is provided as is without any express or implied warranties
  whatsoever. Other limitations apply as described in the file disclaimer.txt.



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