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CImCombine:SetRefImage
The SetRefImage method sets the index of the combining reference image in the CImageSet.
| CImCombine:SetRefImage( index ) | 
 index is the index of the reference image,
beginning at 1.
    index is the index of the reference image,
beginning at 1.
The reference image is used by the combining software to make a header template for the new image and as a target when normalizing the images to a common statistical value. By default, the first image is the reference image. Use this method to change it.