python PIL-检查图像是否透明 [英] python PIL - check if image is transparent

问题描述

我正在将一张图片粘贴到另一张图片上，并查看了

I am pasting an image on another image, and after looking at this question, I saw that in order to paste a transparent image, you need to do

background = Image.open("test1.png")
foreground = Image.open("test2.png")

background.paste(foreground, (0, 0), foreground)

使用正常图片，您应该

background = Image.open("test1.png")
foreground = Image.open("test2.png")

background.paste(foreground, (0, 0)) // difference here

我的问题是，如何检查图像是否透明，以便确定如何使用paste方法(带有或不带有最后一个参数).

my question is, how can I check if an image it transparent so I can determine how to use the paste method (with or without the last parameter).

推荐答案

检查图像的模式以获取alpha透明层.例如，RGB没有透明度，但是RGBA有透明度.

Check the mode of the image for an alpha transparency layer. For example, RGB has no transparency, but RGBA does.

请参见 https://pillow.readthedocs.io/en/latest/请参阅handbook/concepts.html .

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