vtk中图像数据类型转换 -- vtkImageShiftScale

vtkSmartPointer<vtkImageShiftScale> shiftScaleFilter =
vtkSmartPointer<vtkImageShiftScale>::New();
shiftScaleFilter->SetOutputScalarTypeToUnsignedChar();
shiftScaleFilter->SetInputData(image);
shiftScaleFilter->SetShift(-1.0f * image->GetScalarRange()[0]); // brings the lower bound to 0
float oldRange = image->GetScalarRange()[1] - image->GetScalarRange()[0];
std::cout << "Old range: [" << image->GetScalarRange()[0] << ", " << image->GetScalarRange()[1] << "]" << std::endl;
std::cout << "Old range magnitude: " << oldRange << std::endl;
float newRange = 255; // We want the output [0,255]

shiftScaleFilter->SetScale(newRange/oldRange);
shiftScaleFilter->Update();