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Hi Sebastien,

Freeview does not support voxel-specific alpha channel. You can only apply a uniform opacity.

Ruopeng

On Sep 8, 2023, at 9:16 AM, Proulx, Jean Sebastien <JSPROULX@mgh.harvard.edumailto:JSPROULX@mgh.harvard.edu> wrote:

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Dear Freesurfers,

Is it possible to input an alpha channel to freeview? Otherwise said, can one obtain a voxel-specific opacity?

I would see something like freeview underlay.mgz overlay.mgz:opacity=opacity.mgz where the single opacity value is replaced with a file containing the desired voxel-specific opacities.

Thanks for your help and Have a very good day! Sebastien _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edumailto:Freesurfer@nmr.mgh.harvard.edu https://secure-web.cisco.com/1mDCV6Pa3ZS7uV_cynDwa7VHYvmBOigcJLbqZc9Fcbk3ED_...