[vtkusers] Set ImageData to zero

[speedy]

Thanks a lot for your reply Dominique! 
It is much faster indeed to use GetScalarPointer() instead of iterating
through the pixels. I still have a problem though: My class doesn't know the
pixeltype of the image beforehand, but I have to cast the pointer to it. How
can I achieve this? I know there's the method 

Image->GetScalarType(),

but it returns an integer value and I don't know how to proceed with it..


Dominique Töpfer wrote:
> 
> Hi,
> 
> a similar question was discussed here:
> http://vtk.1045678.n5.nabble.com/Fast-element-access-of-vtkImageData-td4640137.html#none
> 
> HTH
> Dominique
> 
> On 27.09.2011 15:47, speedy wrote:
>> Sorry if this question actually has a simple answer, but what is the
>> fastest
>> way to set every pixel of a vtkImageData to zero (or any other value
>> fitting
>> in its pixeltype)?
>> I've tried vtkImageThreshold, but it doesn't seem to do anything or maybe
>> I
>> am using it wrong:
>>
>>    threshold = vtkSmartPointer<vtkImageThreshold>::New();
>>    threshold->SetInput(Image);
>>    threshold->ReplaceOutOn();
>>    threshold->SetOutValue(Value);
>>    threshold->ThresholdByLower(maximum_image_value);
>>    threshold->Update();
>>
>> --
>> View this message in context:
>> http://vtk.1045678.n5.nabble.com/Set-ImageData-to-zero-tp4845442p4845442.html
>> Sent from the VTK - Users mailing list archive at Nabble.com.
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
> 
> 
> -- 
> Thus spake the master programmer:
>      "After three days without programming, life becomes meaningless."
> 
> -- The Tao of Programming by Geoffry James
> 
> Dominique Töpfer, Dipl.-Inform.
> Institute of Medical Physics
> University of Erlangen
> 
> _______________________________________________
> Powered by www.kitware.com
> 
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
> 
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
> 
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
> 


--
View this message in context: http://vtk.1045678.n5.nabble.com/Set-ImageData-to-zero-tp4845442p4849109.html
Sent from the VTK - Users mailing list archive at Nabble.com.