title: what is different color meaning in 9 patch images
body: <p><a href="https://i.stack.imgur.com/IcHOu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IcHOu.png" alt="look this image "></a></p>
  
  <p>I want to understand what is this color change means?</p>
  
  <p>this is only an example..i want to understand what is 9 patch for and how it works</p>
  
  <p>i changed my png to 9.png and after i make some changes (this is NOT that image this only for reference )</p>
  
  <p>i notice that some color is changed in images </p>
  
  <p>i just want to know how to understand which color for what ?
  and how to use it ?</p>