extract signature from SignatureField in Django

Question

here i am using python3 and Django 3.0 Here am i saving the signature into my database and now i need to display this signature in my pdf file

But i am not able to display it in the pdf file

here is my views.py

def jobspecific_view_1(request, pk):
    form = CustomerSignatureForm(request.POST or None)
    if form.is_valid():
        customer_signature_1 = 
              form.cleaned_data.get('customer_signature_1')
        if customer_signature_1!=None:
            job = AddJob.objects.get(id=pk)
            job.customer_signature_1 = customer_signature_1
            job.save()
       ......
       ......

here is my views.py for generating the pdf

def render_to_pdf(template_src, context_dict, pdf_title):
    template = get_template(template_src)
    context =  Context(context_dict)
    html  = template.render(context_dict)
    result = BytesIO()
    pdf = pisa.pisaDocument(BytesIO(html.encode("UTF-8")), result,
                        encoding='UTF-8')

    if not pdf.err:
        response =  HttpResponse(result.getvalue(), content_type='application/pdf')
        response['Content-Disposition'] = "attachment; filename={0}".format(
                                            unidecode(
                                                pdf_title.replace(
                                                    ',', '').replace(
                                                        ';', '').replace(' ', '_')))
    logger.debug('Content-Disposition: {0}'.format(response['Content-Disposition']))
    return response

    logger.error(pdf.err)
    return HttpResponse('We had some errors<pre>%s</pre>' % cgi.escape(html))
  
def generate_pdf_view(request, pk):
    client = request.user.client
    job_id = AddJob.objects.filter(id=pk)
    viewed_job = get_object_or_404(AddJob, id=pk, created_by__client=client)
    job_data={}
    for val in job_id:
        job_data['job_id'] = pk
        job_data['title'] = val.title
        job_data['job_number'] = val.job_number
        job_data['customer_signature_1'] = val.customer_signature_1
        ......
        ......
    pdf_title = u'{0}_{1}_{2}.pdf'.format(
                    job_data['title'], job_date.strftime('%d_%m_%Y'),
                    job_data['job_type'])
    return render_to_pdf('jobs/jobpdf.html',
                     {
                        'pagesize':'A4', 'job_data': job_data,
                        'viewed_job': viewed_job,
                        'request': request,
                     }, pdf_title)

Here is my forms.py

class CustomerSignForm(forms.ModelForm):
    customer_signature_1 = SignatureField(required=False,label="Customer Signature")
    class Meta:
        model = AddJob
        fields = ['customer_signature_1']

Here is my jobspdf.html

<img src="data:image/png;base64,{{job_data.custmer_signature_1}}"/>

Please help me so that i can display the signature in my pdf view at present it not displaying anything in my pdf