在python中旋转图像:推断背景颜色 [英] Rotating image in python: extrapolate background color

问题描述

我正在使用以下python代码旋转图像:

I am rotating an image with the following python code:

from PIL import Image

img = Image.open('banana.jpg')
rotated = img.rotate(10)
rotated.save('banana-rotated.jpg')

这将进行以下转换:

到

如您所见，背景为黑色. 这个问题询问如何用特定颜色填充背景.但是，我想用图像的颜色填充背景.因为我需要旋转许多图像，所以我不想将背景设置为固定颜色.

As you can see, the background is black. This question asks how to fill the background with a specific color. However, I would like to fill the background with the color of the image. Because I need to rotate many images, I do not want to set the background to a fixed color.

是否有某种方法可以扩展图像的边缘，使用从图像中推断出的颜色?理想情况下，如果图像没有统一的背景，这也将起作用.

Is there some way to extend the image at the edges, with a color extrapolated from the image? Ideally, this would also work if the image does not have a uniform background.

推荐答案

这可能会有所帮助: 5.2.0及更高版本的枕头，一个名为fillcolor的新命名参数已添加到Image.rotate.此颜色指定要在旋转的图像之外的区域中使用的背景颜色.

Pillow 5.2.0 onwards, A new named parameter called fillcolor, has been added to Image.rotate. This color specifies the background color to use in the area outside the rotated image.

image.rotate(45, fillcolor='white')

如果图像旋转了90,180,270以外的x度，可能会有所帮助

Could help if image was rotated by x degrees other than 90,180,270,

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