title: HTML5 Canvas | Replace Color | Remove Color
body: <p>What is the fastest way to create copy this image without green color or making green color transparent or removing green color from 100X100 px top left</p>
  
  <p>In this case do I have to check every pixel value?
  This process is too slow, eg: for 100X100px it takes 40000 loops for checking all rgba values</p>
  
  <p><a href="https://i.stack.imgur.com/hZm8o.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hZm8o.png" alt="enter image description here"></a></p>