[vtkusers] test if vtkImageData is blank

[Sebastien Jourdain]

If you have a scalar range on the data array and if the min/max are
equal to 0, you are done...

Seb

On Mon, Dec 20, 2010 at 6:15 PM, Jonathan Morra <jonmorra at gmail.com> wrote:
> Is there a way to quickly tell if a vtkImageData is blank (contains all
> 0's)?  I can't iterate the pixels cause I'm in Java and that's too slow.
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