connected threshold grower issue

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connected threshold grower issue

Salam Al-Attar-2
Hello!
I'm kind of new to this software and have recently discovered a weird glitch (if you can call it that), which I don't know how to go around.
 
Sometimes when I want to threshold the entire image in my mri analysis, I select a seed point from the background, then connected threshold grow it. Of course this selects everything surrounding my image of interest and then I would invert the background so that I would select my image within as the threshold area.

Now here's where the glitch comes up. When I go to threshold it the image,
sometimes the image turns red (which I it should since it is the new threshold
area in white). And sometimes, the background turns red and the image stays
white, even though it was selected as the threshold after the inversion.
 
Thanks in advance for experts in this area who are willing to help.
Sincerely,
Salam


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