如何使用PIL将透明图像的背景设置为白色? [英] How can I set the background of a transparent image to white, using PIL?

问题描述

我有一个透明背景的PNG图像，我想将其调整为另一幅图像，但背景是白色而不是透明背景. 我该如何使用PIL?

I have a PNG image with transparent background and I want to resize it to another image, but with a white background instead of a transparent one. How can I do that with PIL?

这是我的代码:

basewidth = 200
img = Image.open("old.png")
wpercent = (basewidth/float(img.size[0]))
hsize = int((float(img.size[1]) * float(wpercent)))
img = img.resize((basewidth, hsize), PIL.Image.ANTIALIAS)hsize = int((float(img.size[1]) * float(wpercent)))
img.save("new.png")

推荐答案

import Image
from resizeimage import resizeimage

f = Image.open('old.png') 
alpha1 = 0 # Original value
r2, g2, b2, alpha2 = 255, 255, 255,255 # Value that we want to replace it with

red, green, blue,alpha = data[:,:,0], data[:,:,1], data[:,:,2], data[:,:,3]
mask = (alpha==alpha1)
data[:,:,:3][mask] = [r2, g2, b2, alpha2]

data = np.array(f)
f = Image.fromarray(data)
f = f.resize((basewidth,hsize), PIL.Image.ANTIALIAS)

f.save('modified.png', image.format)

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