无需在Python中下载即可获取图像大小 [英] Get image size without downloading it in Python

问题描述

如何在不实际下载的情况下获取图像尺寸？它甚至可能吗？
我有一个图片网址列表，我想为它分配宽度和大小。

How can I get dimensions of image without actually downloading it? Is it even possible? I have a list of urls of images and I want to assign width and size to it.

我知道有一种方法可以在本地进行（< a href =https://stackoverflow.com/questions/1507084/how-to-check-dimensions-of-all-images-in-a-directory-using-python>如何检查所有图像的尺寸目录使用python？），但我不想下载所有图像。

I know there is a way of doing it locally (How to check dimensions of all images in a directory using python?), but I don't want to download all the images.

编辑：

以下编辑。建议，我编辑了代码。我想出了此代码。不确定天气会下载整个文件还是只是一部分（我想要的）。

Following ed. suggestions, I edited the code. I came up with this code. Not sure weather it downloads whole file or just a part (as I wanted).

推荐答案

这是基于ed的答案和我在网上找到的其他东西。我遇到了与.read（24）的grotos相同的问题。从这里下载getimageinfo.py并从这里。

This is based on ed's answer mixed with other things I found on the web. I ran into the same issue as grotos with .read(24). Download getimageinfo.py from here and download ReSeekFile.py from here.

import urllib2
imgdata = urllib2.urlopen(href)
image_type,width,height = getimageinfo.getImageInfo(imgdata)

修改getimageinfo ...

Modify getimageinfo as such...

import ReseekFile

def getImageInfo(datastream):
    datastream = ReseekFile.ReseekFile(datastream)
    data = str(datastream.read(30))

#Skipping to jpeg

# handle JPEGs
elif (size >= 2) and data.startswith('\377\330'):
    content_type = 'image/jpeg'
    datastream.seek(0)
    datastream.read(2)
    b = datastream.read(1)
    try:
        while (b and ord(b) != 0xDA):
            while (ord(b) != 0xFF): b = datastream.read(1)
            while (ord(b) == 0xFF): b = datastream.read(1)
            if (ord(b) >= 0xC0 and ord(b) <= 0xC3):
                datastream.read(3)
                h, w = struct.unpack(">HH", datastream.read(4))
                break
            else:
                datastream.read(int(struct.unpack(">H", datastream.read(2))[0])-2)
            b = datastream.read(1)
        width = int(w)
        height = int(h)
    except struct.error:
        pass
    except ValueError:
        pass

这篇关于无需在Python中下载即可获取图像大小的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！