This backend doesn't support absolute paths.

Error Highlighted code is = photopath = str(a.path )

My Models

class ProductImage(models.Model):

fk_product=models.ForeignKey(Product)

product_image_main=models.ImageField("Image", upload_to = product_main_upload_to ,null=True,blank=True)

product_image_sub1=models.ImageField("Image", upload_to = product_sub1_upload_to ,null=True,blank=True)

product_image_sub2=models.ImageField("Image", upload_to = product_sub2_upload_to,null=True,blank=True)

product_image_sub3=models.ImageField("Image", upload_to = product_sub3_upload_to ,null=True,blank=True)

product_image_sub4=models.ImageField("Image", upload_to = product_sub3_upload_to ,null=True,blank=True)

product_image_sub5=models.ImageField("Image", upload_to = product_sub3_upload_to ,null=True,blank=True)

product_image_sub6=models.ImageField("Image", upload_to = product_sub3_upload_to ,null=True,blank=True)



def __unicode__(self):

    return self.fk_product.name



def save(self):

    super(ProductImage, self).save()

    prod_img=""

    if self.product_image_main:

        a= self.product_image_main

    elif self.product_image_sub1:

        a=self.product_image_sub3

    elif self.product_image_sub2:

        a=self.product_image_sub1

    elif self.product_image_sub3:

        a=self.product_image_sub3

    elif self.product_image_sub4:

        a=self.product_image_sub4

    elif self.product_image_sub5:

        a=self.product_image_sub5

    elif self.product_image_sub6:

        a=self.product_image_sub6

    print a

    basewidth = 1000

    photopath = str(a.path )

    b=str_to_raw(photopath)

    c=re.sub(r'\', "/", b)

    im = Image.open(c).convert('RGB')

    extension = c.rsplit('.', 1)[1]  # the file extension

    filename = c.rsplit('/', 1)[1].rsplit('.', 1)[0]  # the file name only (minus path or extension)

    fullpath = c.rsplit('/', 1)[0]  # the path only (minus the filename.extension)

    medname = filename  + ".jpg"

    wpercent = (basewidth/float(im.size[0]))

    hsize = int((float(im.size[1])*float(wpercent)))

    im = im.resize((basewidth,hsize), Image.ANTIALIAS)

    im.save(fullpath + '/' + medname,format="JPEG",optimize=True, quality=90)