PIL中的透明PNG事实证明不是透明的 [英] Transparent PNG in PIL turns out not to be transparent

问题描述

我已经用这种方法撞墙了一段时间，所以也许有人可以帮忙.

I have been hitting my head against the wall for a while with this, so maybe someone out there can help.

我正在使用PIL打开具有透明背景和一些随机黑色涂鸦的PNG，然后尝试将其放置在另一个PNG(不具有透明性)的顶部，然后将其保存到第三个文件中.

I'm using PIL to open a PNG with transparent background and some random black scribbles, and trying to put it on top of another PNG (with no transparency), then save it to a third file.

最后它全是黑色，这很令人讨厌，因为我没有告诉它是黑色的.

It comes out all black at the end, which is irritating, because I didn't tell it to be black.

我已经用其他帖子中的多个建议的修复程序对此进行了测试.图像以RGBA格式打开，但仍然混乱.

I've tested this with multiple proposed fixes from other posts. The image opens in RGBA format, and it's still messed up.

此外，该程序应该处理各种文件格式，这就是为什么我使用PIL的原因.具有讽刺意味的是，我尝试的第一种格式是很麻烦的.

Also, this program is supposed to deal with all sorts of file formats, which is why I'm using PIL. Ironic that the first format I tried is all screwy.

任何帮助将不胜感激.这是代码:

Any help would be appreciated. Here's the code:

from PIL import Image
img = Image.open(basefile)
layer = Image.open(layerfile) # this file is the transparent one
print layer.mode # RGBA
img.paste(layer, (xoff, yoff)) # xoff and yoff are 0 in my tests
img.save(outfile)

推荐答案

我认为您要使用的是粘贴蒙版参数. 请参见文档，(向下滚动至paste)

I think what you want to use is the paste mask argument. see the docs, (scroll down to paste)

from PIL import Image
img = Image.open(basefile)
layer = Image.open(layerfile) # this file is the transparent one
print layer.mode # RGBA
img.paste(layer, (xoff, yoff), mask=layer) 
# the transparancy layer will be used as the mask
img.save(outfile)

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