图像未调整大小

Question

我有一个表格，用户可以选择自己的个人资料图片并写自己的简历。表单应采用上传的图片并将其尺寸调整为200x200。它会上传图片，但不会进行大小调整。我尝试了以下this tutorial的操作：但是，由于某些原因，我的图像在上载时仍无法调整大小。这是我的代码：

class ProfileForm(ModelForm):
    avatar  = forms.ImageField(required=False, widget=forms.FileInput)
    bio     = forms.CharField(widget=forms.Textarea(attrs={'rows': 3, "placeholder": "Bio"}), max_length=200,
                          required=False)

class Meta:
    model = Profile
    fields = ['avatar', 'bio', 'gender'']

def save(self, *args, **kwargs):
    profile = super(ProfileForm, self).save()

    image = Image.open(profile.avatar)
    resized_image = image.resize((200, 200), Image.ANTIALIAS)
    resized_image.save(profile.avatar.path)

    return profile

class Profile(models.Model):
    GENDER_CHOICES = (
        ('M', 'Male'),
        ('F', 'Female'),
    )
    user    = models.OneToOneField(User, null=True, on_delete=models.CASCADE)
    bio     = models.CharField(max_length=200, null=True)
    avatar  = models.ImageField(storage=OverwriteStorage(), upload_to=create_user_image_path)
    gender  = models.CharField(max_length=1, choices=GENDER_CHOICES, null=True)

正在上传图片，并且一切正常，但是，图片没有调整大小。