[Freesurfer] Tkregister2 resolution difference

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Dear FreeSurfer,

Hi, I'm Yuelin, a graduate student from Caltech. I came across an issue using the Tkregister2 registration GUI: the target scan are always rendered with much lower resolution than the movable scan. This difference in resolution makes it almost impossible to registering details. I wonder if this is a known issue and is there any way to solve that? Any information will be very helpful!

Our lab currently uses version "freesurfer-local-build-dev-20200114" (this is what's shown with the "recon-all version" command, but should be 7.0 or 7.1), I also checked some older versions we used before and the same issue exists.

Thanks, Yuelin