How can I convert an image to grayscale without losing any transparency?

Question

This is my code:

img = cv2.imread(some_path, 0)

Original image:

After running the code:

Obviously losing a lot of transparency.

Answer 1

You can use PILLOW:

from PIL import Image
img = Image.open('image_to_grayscale.png').convert('LA')
img.save('greyscale.png')

Result: