在Python中叠加两个相同大小的图像 [英] Overlay two same sized images in Python

问题描述

我有两张尺寸完全相同的图像，我要做的就是拍摄一张，使其具有50％的透明度，然后将其直接放在另一张上面，就像这样:

I've got two images that are exactly the same dimensions, all I'm trying to do is take one, make it 50% transparent and place it directly on top of the other, like so:

import Image

background = Image.open("bg.png")
overlay = Image.open("over.png")

background = background.convert("RGBA")
overlay = overlay.convert("RGBA")

background_pixels = background.load()
overlay_pixels = overlay.load()

for y in xrange(overlay.size[1]):
    for x in xrange(overlay.size[0]):
         background_pixels[x,y] = (background_pixels[x,y][0], background_pixels[x,y][1], background_pixels[x,y][2], 255)

for y in xrange(overlay.size[1]):
    for x in xrange(overlay.size[0]):
         overlay_pixels[x,y] = (overlay_pixels[x,y][0], overlay_pixels[x,y][1], overlay_pixels[x,y][2], 128)

background.paste(overlay)
background.save("new.png","PNG")

但是我得到的只是50％透明的覆盖层(就这样一半了！).

But all I get is the 50% transparent overlay (so half way there!).

推荐答案

尝试使用 blend()而不是paste()-似乎paste()只是将您要粘贴的图像替换为原始图像.

Try using blend() instead of paste() - it seems paste() just replaces the original image with what you're pasting in.

import Image

background = Image.open("bg.png")
overlay = Image.open("ol.jpg")

background = background.convert("RGBA")
overlay = overlay.convert("RGBA")

new_img = Image.blend(background, overlay, 0.5)
new_img.save("new.png","PNG")

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