python - PIL : pasting an image onto another image, 计算位置

Question

我正在尝试将一张图片粘贴到另一张图片上，但无法计算左上角以外的位置。如何计算右上/下角和左下角的位置？

from io import BytesIO
from PIL import Image


def add_watermark():
    original_image = Image.open('test1.jpg')
    watermark = Image.open('watermark.png')

    watermark_width, watermark_height = watermark.size

    x, y = original_image.size
    margin = 40

    # left top
    position = ((0 + margin, 0 + margin))

    image_with_watermark = Image.new('RGBA', (x, y), (0, 0, 0, 0))
    image_with_watermark.paste(original_image, (0, 0))
    image_with_watermark.paste(watermark, position, mask=watermark)
    image_with_watermark.show()
    buffer = BytesIO()
    image_with_watermark.save(fp=buffer, format='jpeg')


add_watermark()

Answer 1

对左上角、右上角、左下角和右下角尝试以下操作:

position_tl = (0 + margin, 0 + margin)
position_tr = (x - margin - watermark_width, 0 + margin)
position_bl = (0 + margin, y - margin - watermark_height)
position_br = (x - margin - watermark_width, y - margin - watermark_height)