[vtkusers] how to properly handle signed DICOM data

[abhishek gattani]

Hi All,

My DICOM data is signed. When attempting to render it I get "cannot value 
render data of type short, only unsigned char...". From previous posts I 
understand that i can use either vtkImageShiftScale or vtkImageCast to 
convert the types. However, I am not clear by how much amount should I shift 
my input data? One alternative is take the minimum of the data points but 
then any transfer function applied to the data will also need to be changed 
dynamically because the min can vary across data sets. Other alternative is 
just shift by a constant. But what should be this constant value? Any 
insights would be deeply appreciated. Thanks,


Cheers,
Abhi
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