Best way to overlay multiple 2D images?

Hi, I’m interested in making overlays of two or more 2D images in VTK (e.g., two MRIs taken multiple years apart). There appear to be two ways of doing this in VTK:

  1. via vtkImageBlend (
  2. via vtkImageStack (

Can anyone tell me what the pros/cons of the two methods are?
thank you in advance for your assistance,

You’ve asked the same last year and even got an answer: vtkImageStack vs. vtkImageBlend

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Ack!!! Thank you @Andras. Honestly, I checked my discourse history before and didn’t see it. It also didn’t come up when I searched discourse with the keyword “overlay”. My apologies.