[Insight-users] Volume Overlap , why 255 labels?

[LaMoOsH ..]

Hello everyone, 
 
I am using these two images in 
LabelOverlapMeasuresImageFilter
 
so, there should be only one label .. 
why do i get 255 labels in the table result??
 
Thanks 
 
regards, 
  		 	   		  
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