Untitled

<!DOCTYPE html>
<html>
<body>

<p>Image to use:</p>
<img id="scream" width="220" height="277" src="img_the_scream.jpg" alt="The Scream">

<p>Canvas:</p>
<canvas id="myCanvas" width="220" height="220" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.
</canvas>

<script>
window.onload = function() {
  var imageWidth = 220
  var imageHeight = 277
  var size = Math.min(imageWidth, imageHeight)
  var isWidthGreather = imageWidth > imageHeight
  var offset = (isWidthGreather?1:-1) * (imageWidth - imageHeight)/2
  var c = document.getElementById("myCanvas");
  var ctx = c.getContext("2d");
  var img = document.getElementById("scream");
  ctx.drawImage(img, 0, -offset , size, size + offset);
}
</script>

<p><strong>Note:</strong> The canvas tag is not supported in Internet
Explorer 8 and earlier versions.</p>

</body>
</html>