convert image from base64 to image and save in database in django

Question

I'm trying export a string base64 that represents an image taken from canvas html5, this is the code in javascript:

var canvas1 = $("#canvas1")[0];
var ctx1 = canvas1.getContext('2d');
dataURL1 = canvas1.toDataURL();

Whit ajax I sent the image to server:

$.ajax({
    type: "POST",
    url: "/regiter_respuesta_agilidad/",
    data:{
        'imagen1': dataURL1,
    }
});

In views.py of django I use base64.b64decode to export the string to image:

imagen1 = request.POST['imagen1']
image_data = base64.b64decode(imagen1)
imagene = ContentFile(image_data, 'imagen1.png')
answer = Answer(imagen=imagene)

In models.py I have:

class Answer(models.Model):
    imagen = models.ImageField(upload_to=url)

The Problem is when the image is saved, the file imagen1.png is corrupted and I can't open it, Can someone help me with this problem?, or is there another way to do this? thank you very much.

Answer 1

I'm guessing you need to strip the data: off the Data URI returned by canvas.toDataURL();.

A quick google search found some code designed for parsing data uris in python https://gist.github.com/zacharyvoase/5538178 and another: dataurl.py