[vtkusers] what is class that read changed image(16bit -> 8bit)

[heochy]

Hello.......
There is the question..
DICOM Image(.dcm) is 16bit, and is using vtkVolume16Reader...read this
image.
 
Too many errors encountered; the rest of the message is ignored:
 
However, after change 16bit image to 8bit image, what is class that 
read this changed image?
 
I desire a lot of replies.