>  Docs Center  >  Libraries  >  JHU/APL/S1R  >  CLR2LUM

CLR2LUM

CLR2LUM

Name


      CLR2LUM

Purpose


      Compute luminance from a 24-bit color value.

Category


Calling Sequence


      lum = clr2lum(lum)

Inputs


      clr = 24-bit color value. in

Keyword Parameters


Keywords


        /BW Return the color white if lum < 128 else black.
              The gives a contrasting color for things like text.

Outputs


      lum = returned luminance. out
        Range is Min=0., Max=255.

Common Blocks


Notes


Modification History


      R. Sterner, 2004 Mar 12
      R. Sterner, 2010 Apr 30 --- Converted arrays from () to [].
  Copyright (C) 2004, 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.



© 2019 Harris Geospatial Solutions, Inc. |  Legal
My Account    |    Store    |    Contact Us