Input requirements for `-x label` are unclear (what is a "single-voxel label"?) about spinalcordtoolbox

[naga-karthik]

Thank you for the clarification! I got it now. One of those situations where you hit send and immediately realize what something actually means 😅

[joshuacwnewton]

While I agree that label isn't the clearest name, I don't think it's so bad that we need to change it? Personally, I'm happy with starting with documentation changes for now.

[jcohenadad]

you’re not missing anything— as the help says: the expected output of the ‘label’ option is a single point (ie: center of mass of the blob)

[joshuacwnewton]

I'll open up a quick PR to clarify the help and provide an example.

[jqmcginnis]

I think for me, I had the same misunderstanding as the greedy registration tool has the option of specifying the label option for the interpolation mode as well, but here it is used in order to interpolate masks to a different space, which differs from the use case / or functionality provided with the -x label option for sct_apply_transfo's label option.

I am unsure if other toolboxes have a similar understanding or if this is unique to greedy or SCT, respectively.

[jcohenadad]

I guess the problem comes from the word 'label', which is not specific at all to a 'single voxel'. It would have been better to call this option 'single-voxel', but it might be too late now (or is it? not so many people use this, so it won't break too many pipelines...)