[MINC-development] label volumes

[Steve M. Robbins]

On Mon, Jul 30, 2007 at 04:42:12PM -0400, Alex Zijdenbos wrote:
> Hello all,
> 
> Claude and I have been looking at a problem relating to the handling
> of label volumes (e.g., atlases) in minc (1.x). There exist a number
> of atlas files associated with ANIMAL which have intensity scaling in
> them (real range != voxel range). This  causes the labels to appear as
> floating point values, which can sometime be several decimal points
> away from the integer label value; this in turn can cause label values
> to switch over to the adjacent label when manipulated by certain minc
> tools.
> 
> There are two issues or questions:
> 
> 1. How *should* label volumes be constructed?
> 
>      The simple answer I believe is to make sure that the intensity
> mapping is the identity mapping, so that in effect the real values are
> equal to the voxel values.

I think that's right.  In fact, I have a vague recollection (and vague
notes from 2003) that one can "fix" a byte label file using:

	mincreshape -image_range 0 255 bad.mnc good.mnc

Regards,
-Steve
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