PIL Image.resize() 未调整图片大小

发布于 2024-08-01 13:11:48 字数 520 浏览 7 评论 0原文

我有一些奇怪的问题，PIL 没有调整图像大小。

from PIL import Image
img = Image.open('foo.jpg')

width, height = img.size
ratio = floor(height / width)
newheight = ratio * 150

img.resize((150, newheight), Image.ANTIALIAS)

img.save('mugshotv2.jpg', format='JPEG')

此代码运行时没有任何错误，并在正确的文件夹中生成名为 mugshotv2.jpg 的图像，但它不会调整其大小。它做了一些事情，因为图片的大小从 120 kb 下降到 20 kb，但尺寸保持不变。

也许您还可以建议用更少的代码将图像裁剪成正方形的方法。我有点以为 Image.thumbnail 可以做到这一点，但它所做的是将我的图像按宽度缩放到 150 像素，高度保留 100 像素。

原文

I have some strange problem with PIL not resizing the image.

from PIL import Image
img = Image.open('foo.jpg')

width, height = img.size
ratio = floor(height / width)
newheight = ratio * 150

img.resize((150, newheight), Image.ANTIALIAS)

img.save('mugshotv2.jpg', format='JPEG')

This code runs without any errors and produces me image named mugshotv2.jpg in correct folder, but it does not resize it. It does something to it, because the size of the picture drops from 120 kb to 20 kb, but the dimensions remain the same.

Perhaps you can also suggest way to crop images into squares with less code. I kinda thought that Image.thumbnail does it, but what it did was that it scaled my image to 150 px by its width, leaving height 100px.

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纵情客 2024-08-08 13:11:49

今天你应该使用这样的东西：

from PIL import Image

img = Image.open(r"C:\test.png")
img.show()
img_resized = img.resize((100, 100), Image.Resampling.LANCZOS)
img_resized.show()

Today you should use something like this:

from PIL import Image

img = Image.open(r"C:\test.png")
img.show()
img_resized = img.resize((100, 100), Image.Resampling.LANCZOS)
img_resized.show()

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请你别敷衍 2024-08-08 13:11:49

[更新]
ANTIALIAS 已弃用，并将在 Pillow 10 (2023-07-01) 中删除。使用 Resampling.LANCZOS 代替.image.resize((100,100),Image.ANTIALIAS)

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柠檬色的秋千 2024-08-08 13:11:48

resize() 返回已调整大小的图像副本。它不会修改原始内容。正确的使用方法是：

from PIL import Image
#...

img = img.resize((150, newheight), Image.ANTIALIAS)

source

我认为您正在寻找的是 ImageOps.fit功能。来自 PIL 文档：

ImageOps.fit(图像、尺寸、方法、出血、居中) => 图片
返回尺寸和裁剪版本
图像，根据要求裁剪
长宽比和尺寸。尺寸
参数是请求的输出大小
以像素为单位，以 (width, height) 形式给出
元组。

resize() returns a resized copy of an image. It doesn't modify the original. The correct way to use it is:

from PIL import Image
#...

img = img.resize((150, newheight), Image.ANTIALIAS)

source

I think what you are looking for is the ImageOps.fit function. From PIL docs:

ImageOps.fit(image, size, method, bleed, centering) => image
Returns a sized and cropped version of
the image, cropped to the requested
aspect ratio and size. The size
argument is the requested output size
in pixels, given as a (width, height)
tuple.

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~没有更多了~