[vtkusers] Displaying two images using different colors

[Patrick D. Emond]

Hi vtkusers,

I was wondering if someone could help point me in the right direction to 
get a desired result.  I've got two scalar images (vtkImageData), both 
with a single component, that I'd like to display as a single image 
where one image shows as a color (say red) and the other as a different 
color (say green) such that the colors are combined where the images 
overlap (red+green=yellow) or black where both images have intensities of 0.

I've looked at vtkImageAppendComponents to do the job, but when I try 
displaying its output I still get a grayscale image instead of the 
multicolor image I was expecting.

Thanks,
Patrick