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      Add an image with transparency to existing displayed image.


Calling Sequence

      img_tv, img, ix, iy


      img = image to display (2-d or 3-d). in
        Parts of img to be displayed must be
        scaled correctly.
      ix, iy = optional image start position (def=0,0). in

Keyword Parameters


        TRANS=tval Value in a to consider transparent (def=none).
          If img is 2-d then tval must be a value in img.
          If img is a 24-bit color image then tval must be
          a 24-bit color value that occurs in img.


Common Blocks


      Notes: This routine makes it easier to insert an embedded
        smaller image into a displayed image. The image should
        be ready for display in the non-transparent areas. The
        transparent value may be out of that range. For 24-bit
        color images give the 24-bit color value that is
        transparent. Works on the current window.

Modification History

      R. Sterner, 2010 Feb 18
  Copyright (C) 2010, 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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