[vtkusers] resample issue

[Jérôme]

Oops, I just saw that vtkImageMapToColors is a vtkImageAlgorithm, so the
pipeline should work. The problem may come from how you use the returned
pointer: you have to update your pipeline before using the imagedata.

HTH
Jerome

2009/12/2 Jérôme <jerome.velut at gmail.com>

> Hi,
> You should be more precise about your problem. I guess you missed a
> resample->Update() before setting the input of colorMap, but not for sure.
>
> Jerome
>
> 2009/12/2 Karl <bulkmailaddress at gmail.com>
>
> Hi,
>>
>> I am attempting unsuccessfully to use vtkImageResample to change the
>> spacing
>> of an image.
>> I have a 3D volume that is being resliced with a vtkImagePlaneWidget.  I
>> am
>> then requesting the slice.
>> The code works fine until I add this filter, can anyone tell me what I am
>> doing wrong.
>>
>> Thanks
>> KB
>>
>> Code before filter is added (executes with no problem):
>> _________________________________________
>> vtkSmartPointer<vtkImageData> ImageSliceInfo::GetSliceData(QString
>> sliceName)
>> {
>>        // use vtkImageMapToColors to map to 8-bit for output
>>        vtkImageMapToColors* colorMap = vtkImageMapToColors::New();
>>        colorMap->PassAlphaToOutputOff();
>>        colorMap->SetActiveComponent(0);
>>        colorMap->SetOutputFormatToLuminance();
>>        colorMap->SetInput(planeWidget->GetResliceOutput());
>>        colorMap->SetLookupTable(planeWidget->GetLookupTable());
>>
>>        vtkSmartPointer<vtkImageData> slice = colorMap->GetOutput();
>>
>>        colorMap->Delete();
>>        return slice;
>> }
>>
>>
>>
>> Code after filter is added:
>> __________________________________________
>> vtkSmartPointer<vtkImageData> ImageSliceInfo::GetSliceData()
>> {
>>        // resample to isotropic spacing
>>        vtkImageResample* resample = vtkImageResample::New();
>>        resample->SetInput(planeWidget->GetResliceOutput());
>>        resample->SetDimensionality(2);
>>        resample->SetAxisOutputSpacing(0,1);
>>        resample->SetAxisOutputSpacing(1,1);
>>
>>        // use vtkImageMapToColors to map to 8-bit for output
>>        vtkImageMapToColors* colorMap = vtkImageMapToColors::New();
>>        colorMap->PassAlphaToOutputOff();
>>        colorMap->SetActiveComponent(0);
>>        colorMap->SetOutputFormatToLuminance();
>>        colorMap->SetInput(resample->GetOutput());
>>        colorMap->SetLookupTable(planeWidget->GetLookupTable());
>>
>>        vtkSmartPointer<vtkImageData> slice = colorMap->GetOutput();
>>
>>        resample->Delete();
>>        colorMap->Delete();
>>        return slice;
>> }
>>
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