[Neuroimaging] How to apply an affine transform estimated from ITK?

[François Rousseau]

> 
> However, the results are not the same. There is a minus sign for x and y. I don’t understand where the issue comes from. Any help?

As far I understand, it seems that it comes from that ITK uses LPS and nibabel uses RAS.

Is there any function in nibabel to handle such thing ‘transparently’ ?

François