AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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January 25, 2018 08:54AM
From the help for 3dAllineate https://afni.nimh.nih.gov/pub/dist/doc/program_help/3dAllineate.html:
* The option '-nwarp_save sss' lets you save a 3D dataset of the
  the displacement field used to create the output dataset.  This
  dataset can be used in program 3dNwarpApply to warp other datasets.
  ++ If the warp is symbolized by x -> w(x) [here, x is a DICOM 3-vector],
     then the '-nwarp_save' dataset contains w(x)-x; that is, it contains
     the warp displacement of each grid point from its grid location.
  ++ Also see program 3dNwarpCalc for other things you can do with this file:
       warp inversion, catenation, square root, ...
It has been a long time since this option was implemented, so I can't be sure if it still works as advertised. You'll have to try it and see.

However, I'm not sure why you would *want* to combine bilinear warps (a very old idea of mine that didn't prove useful, IMHO) with much more general nonlinear warps.
Subject Author Posted

Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

AjaySK January 04, 2018 12:05PM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

AjaySK January 24, 2018 06:02PM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

Bob Cox January 25, 2018 08:54AM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

AjaySK March 21, 2018 04:58PM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

RWCox March 21, 2018 05:26PM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

AjaySK March 21, 2018 05:53PM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

RWCox March 22, 2018 05:51AM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

AjaySK March 22, 2018 07:20AM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

Bob Cox March 22, 2018 01:20PM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

AjaySK March 22, 2018 02:10PM

Re: Combining transforms 3dAllineate -nwarp (bilinear) and 3dQwarp

AjaySK March 22, 2018 02:10PM