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Harris Geospatial / Docs Center / Libraries / Coyote / CGBLENDIMAGE

CGBLENDIMAGE

CGBLENDIMAGE
  This alpha blends two 24-bit images and displays them with the cgImage command.
 

Categories


    Graphics
   

Params


    foregroundImage: in, required, type=truecolor
        A 24-bit foreground image with the same dimensions as the background image.
    backgroundImage: in, required, type=truecolor
        A 24-bit background image with the same dimensions as the foreground image.

Keywords


    alpha: in, optional, type=float, default=0.5
        A number between 0 and 1 that indicates the percentage of the foreground image
        to alpha-blend into the background image. For example, ALPHA=0.2 will give
        a weigth of 20% to the foreground image pixels and 80% to the background image
        pixels.
  window: in, optional, type=intarr
        A one-, two-, or three-element array giving the window index numbers for
        the foreground, background, and display windows, repectively. If one-element,
        the foreground image is retrieved from that window and displayed in the current
        window. If two elements, the foreground and background images are obtained from
        the first two elements, respectively, and a new third display window is opened.
        This is the same for three elements, except the third element is used to specify
        the display window.
    _ref_extra: in, optional
        Any keyword appropriate for the cgImage command is also accepted by keyword
        inheritance.

Author


      FANNING SOFTWARE CONSULTING::
          David W. Fanning
          1645 Sheely Drive
          Fort Collins, CO 80526 USA
          Phone: 970-221-0438
          E-mail: david@idlcoyote.com
          Coyote's Guide to IDL Programming: http://www.idlcoyote.com

History


    Change History::
        Written by: David W. Fanning, 26 May 2009.
        Added the WINDOW keyword. 16 February 2012. DWF.

Copyright


    Copyright (c) 2009-2012, Fanning Software Consulting, Inc.



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