Hi Rick,
Actually, I have a simple nifti image that its orientation is not the same as MNI. When I open it in AFNI, its view is completely different from the MNI standard image. For example, its axial view is the same as coronal view of MNI image and its sagittal is a rotated one comparing to MNI image. I want to change its orientation exactly the same as an image in MNI.
Siamak