[vtkusers] How can I handle the vtkImageData's RGB components individually.

[Sedat DOGAN2]

Dear friends,
I compute 3d gradient of a volume by using vtkImageGradient filter as in the text book.
This filter generates an output of float values with 3 components. On the other hand,
vtkImageGradientFilter gives an output of the type vtkImageData.

I want to assign the scalar values of the final vtkImageData to three 1-D pointer arrays which these one dimensional 3 pointers will correspond to each of  3 component's scalar values. How can I do this?

Briefly I can ask the same question, like this:

 If I have a vtkImageData  with RGB values (in this case, the number of the scalar components is 3 and each of them corresponds to Red Green and blue respectively), how can I handle these R, G, B values into 3 different pointers which represent R G B values individually.I tried to implement the ImageData as if its scalar components are vtkArrays with tuples. But I couldn't succeed. 

To be more clear, I want to show you the following codes:

vtkImageGradient *imGrad=vtkImageGradient::New();
    imGrad->SetInput(TiffReader->GetOutput) ;
    imGrad ->SetDimensionality(3);
    imGrad->HandleBoundariesOn();

vtkImageData *imageData;
imageData=imGrad->GetOutput();  /*Here, I think imageData must have 3 components.
int *myPointer1,*mypointer2, *myPointer3;/*I want to assign 1st component's scalars to myPointer1, 2nd to myPointer2 and so on.

I know that, the scalar components of vtkImageData can be reached by the function  (void *) GetScalarPointer(int,int,int). But I couldn't understand, how R G B components are ordered in this pointer's addresses. Are they ordered in the form of RGB, RGB, RGB or in another way? I tried to use vtkExtractComponents but still couldn't solve my problem.

Please help me.
Thanks in advance.
Sedat Dogan.


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