ImageJ - Why Max, Min value change when I change Histogram Bins?

Question

I'm using ImageJ to view Histogram of DICOM image.
When I show Histogram for the first time, I see Min= -719, Max=1402.

But when I press Alt+H to change Bins to 100. Max, Min value is change to 0 & 255.
I think when change bins then only Bin Width should change value, I don't know why Max, Min, Count value is changed.
You can download the DICOM image in this link: https://imagej.nih.gov/ij/images/CT%20Scan.dcm

Answer 1

It seems when you focus on screen "Histogram of CT" and press Alt+H to change Bins, ImageJ will use the Histogram as a input image to draw Histogram.
That why you see Count=72000 = 300x240 pixels in Histogram of CT screen.