IndexedImageToRGB:

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   Converts an indexed image to RGB.
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   Form:
   r = IndexedImageToRGB( x, map )
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   ------
   Inputs
   ------
   x              (m,n)       Indexed image
   map            (:,3)       Color map

   -------
   Outputs
   -------
   r              (m,n,3)     RGB

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