title: Crop/Remove Unwanted Space at the edges of image
body: <p>I have search a lot to remove the unwanted space but could not found. I only found links which can used to remove black and white background space. But my background images can be anything. So, If I have these images,</p>
  
  <p><img src="https://i.stack.imgur.com/V0Bkl.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/Yjst3.png" alt="Image1"></p>
  
  <p><img src="https://i.stack.imgur.com/I8pkW.png" alt="enter image description here"></p>
  
  <p>How I can extract the part of image which I required. For example,</p>
  
  <p><img src="https://i.stack.imgur.com/P9Twh.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/4vDMc.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/THT3j.png" alt="enter image description here"></p>