title: How to crop a polygonal area from an image in a WinForm pictureBox?
body: <p>How can I crop a part of an image with a polygon? For example I have 6 coordinates and I would like to cut this part of an image.</p>
  
  <p><a href="https://i.stack.imgur.com/KBx0P.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KBx0P.png" alt="enter image description here"></a></p>