Hi there,
I use VTK to display medical images like CT and MR, which in the medical imaging domain are high-resolution imaging modalities. My problem is that when I render these images linear artifacts along pixel boundaries begin to appear and are very stark when zoomed to the pixel level.
They seem to arise from a limitation of the vtkImageActor to only permit linear interpolation in their texture maps. I found this old VTK thread, that seemed related.
https://public.kitware.com/pipermail/vtkusers/2005-May/030221.html
In it the respondent indicates that this limitation is imposed by OpenGL as not all version support cubic interpolation. While this thread is 15 years old I don’t see any indication from the VTK documentation that the situation has changed.
Is this issue a problem for other users? Are there any intentions for VTK developers to extend the OpenGL texture maps to include cubic (or higher order) interpolation?
I look forward to hearing from others about this.
Best regards,
Spencer