V5 Vision Sensor Not Seeing Black

I’m attempting to program a line follower with the V5 camera. When define a color signature as the black line, the camera only defines the white spaces as objects. Adjusting the sensitivity doesn’t change the issue. Has anyone else had this issue? How can it be fixed?

The vision sensor needs at least some color information to work with, hence, black, grey and white are generally not suitable for using to set signatures.