如何将具有透明性的PNG图像粘贴到PIL中的另一幅没有白色像素的图像? [英] How to paste a PNG image with transparency to another image in PIL without white pixels?

问题描述

我有两个图像，一个背景和一个带有透明像素的PNG图像.我正在尝试使用Python-PIL将PNG粘贴到背景上，但是当我粘贴两个图像时，在PNG图像周围有透明像素的地方得到了白色像素.

I have two images, a background and a PNG image with transparent pixels. I am trying to paste the PNG onto the background using Python-PIL but when I paste the two images I get white pixels around the PNG image where there were transparent pixels.

我的代码:

import os
from PIL import Image, ImageDraw, ImageFont

filename='pikachu.png'
ironman = Image.open(filename, 'r')
filename1='bg.png'
bg = Image.open(filename1, 'r')
text_img = Image.new('RGBA', (600,320), (0, 0, 0, 0))
text_img.paste(bg, (0,0))
text_img.paste(ironman, (0,0))
text_img.save("ball.png", format="png")

我的图像:

My images:

我的输出图像:

如何使用透明像素而不是白色?

How can I have transparent pixels instead of white?

推荐答案

您需要在粘贴功能中将图像指定为蒙版，如下所示:

You need to specify the image as the mask as follows in the paste function:

import os
from PIL import Image

filename = 'pikachu.png'
ironman = Image.open(filename, 'r')
filename1 = 'bg.png'
bg = Image.open(filename1, 'r')
text_img = Image.new('RGBA', (600,320), (0, 0, 0, 0))
text_img.paste(bg, (0,0))
text_img.paste(ironman, (0,0), mask=ironman)
text_img.save("ball.png", format="png")

给你

要将背景图像和透明图像居中放置在新的text_img上，您需要根据图像尺寸计算正确的偏移量:

To centre both the background image and the transparent image on the new text_img, you need to calculate the correct offsets based on the images dimensions:

text_img.paste(bg, ((text_img.width - bg.width) // 2, (text_img.height - bg.height) // 2))
text_img.paste(ironman, ((text_img.width - ironman.width) // 2, (text_img.height - ironman.height) // 2), mask=ironman)

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