How can I create a Python script that modifies the background color of an onion image to black?

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To modify the background color of an onion image to black using Python, you can use the OpenCV library. Here's an example script:

import cv2

# Load the onion image
img = cv2.imread('onion.jpg')

# Convert the image to grayscale
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

# Threshold the image to create a mask of the onion
thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY_INV)[1]

# Invert the mask so that the onion is white and the background is black
mask = cv2.bitwise_not(thresh)

# Use the mask to set the background color to black
img[mask == 0] = [0, 0, 0]

# Save the modified image
cv2.imwrite('onion_black_background.jpg', img)

In this script, we first load the onion image using the cv2.imread() function. We then convert the image to grayscale using cv2.cvtColor(), and threshold the grayscale image to create a mask of the onion using cv2.threshold(). We invert the mask using cv2.bitwise_not() so that the onion is white and the background is black. Finally, we use the mask to set the background color of the original image to black, and save the modified image using cv2.imwrite().