function imageToBlob(image) {
  // Create a canvas to render the image on
  var canvas = document.createElement('canvas');
  canvas.width = image.width;
  canvas.height = image.height;

  // Create a context and render the image
  var ctx = canvas.getContext('2d');
  ctx.drawImage(image, 0, 0, image.width, image.height);

  // Get the image data
  var imageData = ctx.getImageData(0, 0, image.width, image.height).data;

  // Create a blob with the imageData
  var blob = new Blob(imageData, {type: 'image'});

  // Return the blob
  return blob;
}