魔杖：Image.composite將bg-image變成黑色

Question

我有個問題。 以下代碼可以正常工作，並且將兩個圖像合並在一起。 但是最終構圖中的背景圖像是完全黑色的。

任何猜測，這是什么問題？

from wand.image import Image

with Image(filename=bgimage) as back:
    with Image(filename=qrcode) as front:
        with Image(width=back.width, height=back.height) as new_image:
            new_image.composite(front, left=1000, top=900)
            new_image.save(filename=qr_output)

Answer 1

嘗試刪除new_image部分，並簡化所有操作。

with Image(filename="wizard:") as back:
  with Image(filename="rose:") as front:
    back.composite(front,
                   top=back.height-front.height,
                   left=back.width-front.width)
    back.save(filename="/tmp/output.png")

如果您嘗試重用back實例，請利用wand.image.Image.clone

with Image(filename=bgimage) as back:
  with Image(filename=qrcode) as front:
     with back.clone() as new_image:
       new_image.composite(front, left=1000, top=900)
       new_image.save(filename=qr_output)