PIL Image.size返回相反的宽度/高度 [英] PIL Image.size returns the opposite width/height

问题描述

使用PIL确定图像的宽度和高度

Using PIL to determine width and height of images

在一个特定的图像上(幸运的是，只有一个-但是很麻烦)，从image.size返回的宽度/高度是相反的. 图片:
http://storage.googleapis.com/cookila-533ebf752b9d1f7c1e8b4db3/IMG_0004.JPG

On a specific image (luckily only this one - but it is troubling) the width/height returning from image.size is the opposite. The image:
http://storage.googleapis.com/cookila-533ebf752b9d1f7c1e8b4db3/IMG_0004.JPG

代码:

from PIL import Image
import urllib, cStringIO

file = cStringIO.StringIO(urllib.urlopen('http://storage.googleapis.com/cookila-533ebf752b9d1f7c1e8b4db3/IMG_0004.JPG').read())
im=Image.open(file)
print im.size

结果是-(2592, 1936)
应该相反

The result is - (2592, 1936)
should be the other way around

推荐答案

原因是此图片具有

The reason for this is that this image has Exif Orientation metadata associated with it that will cause applications that respect that property to rotate it:

# identify -verbose IMG_0004.JPG | grep Orientation
  Orientation: RightTop
    exif:Orientation: 6

与常规图像比较:

# identify -verbose iceland_pano.jpg | grep Orientation
  Orientation: TopLeft
    exif:Orientation: 1

因此图像尺寸实际上是横向的(宽于高)，但是会在浏览器，图像查看器等显示时旋转.

So the image dimensions are actually landscape (more wide than high), but it will get rotated on display by browsers, image viewers etc.

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