how set image (dimension) upload height and weight in django models without from

class Member(models.Model):

    id = models.AutoField(db_column='ID', primary_key=True) 

    name = models.CharField(db_column='NAME', max_length=255) 

    member = models.CharField(db_column='MEMBER', max_length=255) 

    sequence_num = models.IntegerField(db_column='SEQUENCE_NUM') 

    img_url = models.FileField(db_column='IMG_URL',

        storage=S3BotoStorage(bucket=settings.S3_BUCKET_COMMON,location=settings.CDN_PREFIX_MEMBER_IMG, calling_format=OrdinaryCallingFormat()), 

        max_length=200, blank=True, null=True)

    class Meta:

        managed = False

        db_table = 'MEMBER'

how set image (dimension) upload height and weight  in img_url FileField 

please thank you

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