title: GUI Measuring Picture Size for Cropping
body: <p>I am new to GUI programming. I want to create something that can load an image and then I can either measure the part of the picture I want and can load it into a cropping method or have to return the area of the crop. Does anyone have suggestions for accomplishing that?</p>
  <p>I have a program with PySimpleGUI that can load an image, but I am not sure where to go from there to get the capacity to measure the item.</p>