I've opened a .m figure that was generated earlier.
Next, I would like to know the xy position of the points on the figure that exactly match with 100 on the colorbar.
This could either be a pixel or list of pixels (as per their xy position) that correspond to 100, or, a marked region on the figure that highlights all points corresponding to 100.
Note: I'm doing this as my final aim is to calculate the area of the spot size by knowing the location of its boundaries. In other cases the spot size is bigger or an arbitary shape. I've taken the simplest case for this question.