[vtkusers] test if vtkImageData is blank

[Jonathan Morra]

I tried this, and after invoking Modified() on the image data, the scalar
range is still [0, 0].

On Sun, Dec 26, 2010 at 10:15 AM, Karthik Krishnan <
karthik.krishnan at kitware.com> wrote:

> GetScalarRange will re-compute the scalar range only if the image has been
> modified. It has time stamps internally to avoid re-computing the scalar
> range during every call to GetScalarRange().
>
> The method SetScalarComponentFromDouble does not change the MTime of the
> image for efficiency.
>
> Invoke Modified() on the image and then invoke GetScalarRange() and you
> should see it update.
>
>
> --
> karthik
>
>
>
>
> On Sun, Dec 26, 2010 at 11:19 PM, Sebastien Jourdain <
> sebastien.jourdain at kitware.com> wrote:
>
>> I have no idea on the expected behavior... And I'm not much familiar
>> with imageData...
>>
>> Sorry,
>>
>> Seb
>>
>> On Sun, Dec 26, 2010 at 6:27 PM, Jonathan Morra <jonmorra at gmail.com>
>> wrote:
>> > This would appear to work, but after
>> > calling .SetScalarComponentFromDouble(x, y, z, 0, 1) the
>> > image.GetScalarRange() still returns [0, 0] which, I would assume, it
>> > shouldn't.  Am I doing something wrong?
>> >
>> > On Sun, Dec 26, 2010 at 8:47 AM, Sebastien Jourdain
>> > <sebastien.jourdain at kitware.com> wrote:
>> >>
>> >> 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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