# разворачивает изображение, внутри исходного на некоторый угол angle,
    # используя color_name в качестве цвета бэкграунда
    @staticmethod
    def rotate_image(source_image_path, source_image_name, angle, back_color='black', dest_image_path=''):
        img = Image.open(source_image_path)
        dest_image_path = ImageStructure.gen_name_from_source(source_image_path, source_image_name, dest_image_path,
                                                              'rotate-')
        angle = random.randrange(0, 30)
        rotate = img.convert('RGBA').rotate(int(angle), expand=1)
        background = Image.new('RGBA', rotate.size, back_color)
        out = Image.composite(rotate, background, rotate)
        w, h = img.size
        out.convert(img.mode).resize((int(w), int(h)), Image.ANTIALIAS)
        out.save(dest_image_path, 'jpeg')