Unsing ginput to reading pixel in graylevel image
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I wondered if anyone knows a function or method used to read the pixel values in an image. Here is what I mean. I have a gray-level image, and I can use the ginput function to select the coordinates. How can I use the ginput to read the intensity value in the gray image as "live" or before select the position? The reason for doing this, I want to know what is the highest intensity value that my ginput pointing to. As you know, some images gradient in the intensity value.
I was reading to the ginput code itself, but I only could change the arrow color instead of black to red. I could not understand or modify the code itself to read the intensity value when I point to the intensity area in the image.