Hi Alexander, If you are editing FS recons, then you should keep the eraser value set to "1" so that the edits can be detected by recon-all. -Louis

On Mon, 10 Feb 2014, Ruopeng Wang wrote:

Hi Alexander,

Eraser value is used for erasing. Brush value is used for drawing. To erase, just hold shift key and press left mouse button.

Best, Ruopeng

On 02/10/2014 10:23 AM, Denker, Alexander (NIH/NIMH) [F] wrote:

...

Hi all,

This is probably a very elementary error in my use of Freeview, but I have been having trouble adding voxels to scans. I set the eraser value to "0", but when I draw, the voxel still shows up as a black box instead of grey. Am I not setting the right values or am I just in the wrong viewing mode?

Thanks! Alexander

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Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

In terms of FS editing, you should be only adding voxels which have a value of 255 to the wm.mgz (or cloning voxels into the brainmask.mgz). If you are segmenting or drawing labels then select the color LUT for the colormap and then select the name of the structure you are segmenting. Are you using the left mouse button to draw voxels?

If the colormap is set to grayscale and you are trying to draw in voxels with a very low value (<40) then you will probably have to adjust the min/max settings before they are visible by eye. Alternatively, you could switch the colormap to Jet or Heat, but that may make it difficult to edit in general.

On Mon, 10 Feb 2014, Denker, Alexander (NIH/NIMH) [F] wrote:

So if I keep the value of the eraser at "1" then what do I need to change to add the voxels? It seems that no matter what value I put for drawing/erasing, I click and get a black box drawn on the screen. It seems that I am not combining button-clicks or values for the eraser and adding correctly.

Thank you

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-----Original Message----- From: Louis Nicholas Vinke [vinke@nmr.mgh.harvard.edu] Sent: Monday, February 10, 2014 02:04 PM Eastern Standard Time To: Denker, Alexander (NIH/NIMH) [F] Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Erasing, adding voxels in Freeview

Hi Alexander, If you are editing FS recons, then you should keep the eraser value set to "1" so that the edits can be detected by recon-all. -Louis

On Mon, 10 Feb 2014, Ruopeng Wang wrote:

...

Hi Alexander,

Eraser value is used for erasing. Brush value is used for drawing. To erase, just hold shift key and press left mouse button.

Best, Ruopeng

On 02/10/2014 10:23 AM, Denker, Alexander (NIH/NIMH) [F] wrote:

...

Hi all,

This is probably a very elementary error in my use of Freeview, but I have been

having trouble adding voxels to scans. I set the eraser value to "0", but when I draw, the voxel still shows up as a black box instead of grey. Am I not setting the right values or am I just in the wrong viewing mode?

...

...

Thanks! Alexander

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

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Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

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