JavaScript send base64 image data to cfc via ajax send base64 image to server,send base64 image to web

I am using html2canvas.js to create a <canvas> image from a div on a page. What I'd like to do is send the rendered base64 image to a cfc via ajax so I can actually save the image to a folder on the server and return the file path to the page.

The issue I am running into is that when I send the base64 encoded data to the cfc, the cfc interprets the data, but with several instances of "[invalid]" within the data.

If I just post the image to the DOM, the image renders just fine. Here is a link to a gist that has both the normal image created compared to the one that I dump from the argument passed into the cfc: https://gist.github.com/ronnieduke/d83dfb3e31677191f88e

Here is the Ajax I am running (where img.src is the result of the canvas data posted in the link above)

var image = new Image();
image.id = 'pic';
// This results in the base64 data posted in image-normal.txt in the gist
image.src = canvas.toDataURL("image/png");
		            
var data =  new FormData();
data.append('imgData',image.src);
		            
// Genrate images in cfc
$.ajax({
  url: 'my.cfc?method=generateImage',
  type:'POST',
  data:data,
  dataType:'JSON',
  processData: false,
  cache:false,
  async:false,
  contentType: false,
  success:function(data){
    console.log(data);
  },
  error:function(result){
    alert(result.responseText);
  }
});

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