JavaScript Manipulating pixel data on image with html canvas and JS

OK, so I'm trying to take an image on my machine and manipulate it using a canvas and some JS... However, I keep getting the error:

"Image from origin 'file://' has been blocked from loading by Cross-Origin Resource Sharing policy: Invalid response. Origin 'null' is therefore not allowed access. "

I thought that if I didn't modify the original image, and only modified a copy of the image data, I would be ok. But for some reason, it still doesn't work. Anyone know what I should do? This is the code I have currently:

$(document).ready(function() {
  var canv = document.getElementById("img_canvas");
  var ctx = canv.getContext("2d");
  var img = new Image();
  img.crossOrigin = "Anonymous";
  img.src = "img/meAndTheOcean.jpg";

  $(img).load(function() {
    ctx.drawImage(img, 0, 0);
    var img_data = ctx.getImageData(0,0,canv.width, canv.height);
    var pixels = img_data.data;
    var npixels = img_data.width * img_data.height;
    var cpyPixels = ctx.createImageData(img_data.width, img_data.height);
    for (var i = 0; i < npixels; i++){
      cpyPixels[i*4] = 255 - pixels[i*4];
      cpyPixels[i*4 + 1] = 255 - pixels[i*4 + 1];
      cpyPixels[i*4 + 2] = 255 - pixels[i*4 + 2];
    }
    ctx.putImageData(cpyPixels,0,0);
  });
});
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