[vtkusers] vtkImageSeperableConvolution output data type

[Jothybasu Selvaraj]

Hi all,

I am using vtkImageSeperableConvolution filter to convolve my imageData
with a custom kernel. My inage data is of type double, but I can set
vtkDoubleArray as kernel to tis filter.

I wonder whether it type casts internally to the input image data type or
do i need to cast it using vtkImageCsat before (double to float, since
kernel as float) and after convolution.

-- 
Jothy
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