Hi, there,
I have question about FreeSurferColorLUT label Unkown in annotation file.
In FreeSurferColorLUT, I read that
#No. Label Name: R G B A
0 Unknown 0 0 0 0
I load the inflated surface of a subject, import lh.aparc.annot file. All the subcortical region are labelled as "Unknown" Then I load the lh.aparc.annot file using read_annotation.m to MATLAB as [vertices, label_val, colortable] = read_annotation(annotation_filename);
Since the RGB of label Unknown is zero, then its label value in read_annotation.m should also be zero, since annotation value = (R) + (G * 256) + (B * 256^2)
However, there are no vertices with label_val = 0 when I use unknown = find(label_val == 0). I also check the label_val of several randomly picked verteices in unkown (subcortical) region, they gave me different values. I thought I should find the same values, although they may not equal to zero.
So, my question is how to find the vertices which are labelled as unknown in annotation file?
Thanks! Guang
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