Plot only highly important section

[Bk073]

Can we plot only the important section?
And after looking into the image, how can we describe which part is more important than other?

For example, in this image how can I say among those colored part which is more important? And is there any way to get only lets say the purple circle if that's more important?

I tried filtering the grayscale_cam image based on the values say keeping only those values greater than 0.9, and I get this:

And when I plot it into original Image I am getting other colors as well:

cam_image_test = show_cam_on_image(rgb_img.squeeze(0), grayscale_, use_rgb=False)