This function is useful for printing out multiple passport photos. It duplicates the input image and produces a 3*3 duplication of the input image.

gistfile1.txt

import cv2
import numpy as np

WHITE = (255, 255, 255)


def dup_img_9(
    file_in: str, file_out: str, pad_horizontal: int = 10, pad_vertical: int = 10
):
    """
    This function is useful for printing out multiple passport photos.
    It duplicates the input image and produces a 3*3 duplication of the input image.

    Args:
        file_in (str): the path to the input image
        file_out (str): the path to the output image
        pad_horizontal (ing): the size of the horizontal white padding around each image
        pad_vertical (ing): the size of the vertical white padding around each image
    """

    # Read the original image
    im = cv2.imread(file_in)

    # Add white padding for each input image
    im_pad = cv2.copyMakeBorder(
        im,
        pad_vertical,
        pad_vertical,
        pad_horizontal,
        pad_horizontal,
        cv2.BORDER_CONSTANT,
        value=WHITE,
    )

    # Duplicate images
    arr = np.concat((im_pad, im_pad, im_pad), axis=1)
    arr = np.concat((arr, arr, arr), axis=0)

    # Save the new image
    cv2.imwrite(file_out, arr)