Vision proccessing won't work
 

We have tried using the "absolute difference" function of the color operators in our vision proccessing VI in LabView, but the output of the function is always a completely black image. When we tested the function in the "Image Assistant" with sample images it worked just fine.
Does anybody knows what could be the problem and how to fix it?

*The VI is attached here

Re: Vision proccessing won't work
 

If the values are small and are displayed with a grayscale color table, it will appear black. You may need to right click and change the palette to binary.

Greg McKaskle