blocks|key|521309|text|库尔特的答案需要稍微修改一下才能为我工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|521310|首先，在ubuntu上：sudo+apt-get+install+python-imaging|offset|length|style|CODE|521311|然后：|521312|from+PIL+import+Image
im=Image.open(filepath)
im.size+#+(width,height)+tuple|code-block|syntax|javascript|521313|有关更多信息，请查看handbook。|521314|entityMap|0|LINK|mutability|MUTABLE|url|http://effbot.org/imagingbook/image.htm^0|0|C|Z|0|0|0|A|8|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|14|8|@]|9|@$D|15|E|16|1|17]]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

Kurts answer needed to be slightly modified to work for me.

First, on ubuntu: <code>sudo apt-get install python-imaging</code>

Then:

<pre><code>from PIL import Image
im=Image.open(filepath)
im.size # (width,height) tuple
</code></pre>

Check out the <a href="http://effbot.org/imagingbook/image.htm" rel="noreferrer">handbook</a> for more info.

blocks|key|737816|text|如果你恰好安装了ImageMagick，那么你可以使用'identify‘。例如，您可以这样命名它：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|737817|path+=+"//folder/image.jpg"
dim+=+subprocess.Popen(["identify","-format","\"%25w,%25h\"",path],+stdout=subprocess.PIPE).communicate()[0]
(width,+height)+=+[+int(x)+for+x+in+re.sub('[\t\r\n"]',+'',+dim).split(',')+]|code-block|syntax|javascript|737818|entityMap|0|LINK|mutability|MUTABLE|url|http://www.imagemagick.org/|1|http://www.imagemagick.org/script/escape.php^0|8|B|0|S|8|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

If you happen to have <a href="http://www.imagemagick.org/" rel="nofollow noreferrer">ImageMagick</a> installed, then you can use '<a href="http://www.imagemagick.org/script/escape.php" rel="nofollow noreferrer">identify</a>'. For example, you can call it like this:

<pre><code>path = "//folder/image.jpg"
dim = subprocess.Popen(["identify","-format","\"%w,%h\"",path], stdout=subprocess.PIPE).communicate()[0]
(width, height) = [ int(x) for x in re.sub('[\t\r\n"]', '', dim).split(',') ]
</code></pre>

blocks|key|737853|text|这是一个Python3脚本，它返回一个元组，其中包含.png、.gif和.jpeg的图像高度和宽度，而不使用任何外部库(即上面提到的Kurt+McKee+)。把它移植到Python2应该相对容易些。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|737854|import+struct
import+imghdr

def+get_image_size(fname):
++++'''Determine+the+image+type+of+fhandle+and+return+its+size.
++++from+draco'''
++++with+open(fname,+'rb')+as+fhandle:
++++++++head+=+fhandle.read(24)
++++++++if+len(head)+!=+24:
++++++++++++return
++++++++if+imghdr.what(fname)+==+'png':
++++++++++++check+=+struct.unpack('>i',+head[4:8])[0]
++++++++++++if+check+!=+0x0d0a1a0a:
++++++++++++++++return
++++++++++++width,+height+=+struct.unpack('>ii',+head[16:24])
++++++++elif+imghdr.what(fname)+==+'gif':
++++++++++++width,+height+=+struct.unpack('<HH',+head[6:10])
++++++++elif+imghdr.what(fname)+==+'jpeg':
++++++++++++try:
++++++++++++++++fhandle.seek(0)+#+Read+0xff+next
++++++++++++++++size+=+2
++++++++++++++++ftype+=+0
++++++++++++++++while+not+0xc0+<=+ftype+<=+0xcf:
++++++++++++++++++++fhandle.seek(size,+1)
++++++++++++++++++++byte+=+fhandle.read(1)
++++++++++++++++++++while+ord(byte)+==+0xff:
++++++++++++++++++++++++byte+=+fhandle.read(1)
++++++++++++++++++++ftype+=+ord(byte)
++++++++++++++++++++size+=+struct.unpack('>H',+fhandle.read(2))[0]+-+2
++++++++++++++++#+We+are+at+a+SOFn+block
++++++++++++++++fhandle.seek(1,+1)++#+Skip+`precision'+byte.
++++++++++++++++height,+width+=+struct.unpack('>HH',+fhandle.read(4))
++++++++++++except+Exception:+#IGNORE:W0703
++++++++++++++++return
++++++++else:
++++++++++++return
++++++++return+width,+height|code-block|syntax|javascript|737855|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a python 3 script that returns a tuple containing an image height and width for .png, .gif and .jpeg without using any external libraries (ie what Kurt McKee referenced above). Should be relatively easy to transfer it to Python 2.

<pre><code>import struct
import imghdr

def get_image_size(fname):
 '''Determine the image type of fhandle and return its size.
 from draco'''
 with open(fname, 'rb') as fhandle:
 head = fhandle.read(24)
 if len(head) != 24:
 return
 if imghdr.what(fname) == 'png':
 check = struct.unpack('&gt;i', head[4:8])[0]
 if check != 0x0d0a1a0a:
 return
 width, height = struct.unpack('&gt;ii', head[16:24])
 elif imghdr.what(fname) == 'gif':
 width, height = struct.unpack('&lt;HH', head[6:10])
 elif imghdr.what(fname) == 'jpeg':
 try:
 fhandle.seek(0) # Read 0xff next
 size = 2
 ftype = 0
 while not 0xc0 &lt;= ftype &lt;= 0xcf:
 fhandle.seek(size, 1)
 byte = fhandle.read(1)
 while ord(byte) == 0xff:
 byte = fhandle.read(1)
 ftype = ord(byte)
 size = struct.unpack('&gt;H', fhandle.read(2))[0] - 2
 # We are at a SOFn block
 fhandle.seek(1, 1) # Skip `precision' byte.
 height, width = struct.unpack('&gt;HH', fhandle.read(4))
 except Exception: #IGNORE:W0703
 return
 else:
 return
 return width, height
</code></pre>

blocks|key|521475|text|这是一种无需第三方模块即可获取png文件大小的方法。来自http://coreygoldberg.blogspot.com/2013/01/python-verify-png-file-and-get-image.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|521476|import+struct

def+get_image_info(data):
++++if+is_png(data):
++++++++w,+h+=+struct.unpack('>LL',+data[16:24])
++++++++width+=+int(w)
++++++++height+=+int(h)
++++else:
++++++++raise+Exception('not+a+png+image')
++++return+width,+height

def+is_png(data):
++++return+(data[:8]+==+'\211PNG\r\n\032\n'and+(data[12:16]+==+'IHDR'))

if+__name__+==+'__main__':
++++with+open('foo.png',+'rb')+as+f:
++++++++data+=+f.read()

++++print+is_png(data)
++++print+get_image_info(data)|code-block|syntax|javascript|521477|当您运行此命令时，它将返回：|521478|True
(x,+y)|521479|还有另一个也包含JPEG处理的例子：http://markasread.net/post/17551554979/get-image-size-info-using-pure-python-code|521480|entityMap|0|LINK|mutability|MUTABLE|url|http://coreygoldberg.blogspot.com/2013/01/python-verify-png-file-and-get-image.html|1|http://markasread.net/post/17551554979/get-image-size-info-using-pure-python-code^0|S|2B|0|0|0|0|0|I|29|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|X]]]]

Here's a way to get dimensions of a png file without needing a third-party module. From <a href="http://coreygoldberg.blogspot.com/2013/01/python-verify-png-file-and-get-image.html">http://coreygoldberg.blogspot.com/2013/01/python-verify-png-file-and-get-image.html</a>

<pre><code>import struct

def get_image_info(data):
 if is_png(data):
 w, h = struct.unpack('&gt;LL', data[16:24])
 width = int(w)
 height = int(h)
 else:
 raise Exception('not a png image')
 return width, height

def is_png(data):
 return (data[:8] == '\211PNG\r\n\032\n'and (data[12:16] == 'IHDR'))

if __name__ == '__main__':
 with open('foo.png', 'rb') as f:
 data = f.read()

 print is_png(data)
 print get_image_info(data)
</code></pre>

When you run this, it will return:

<pre><code>True
(x, y)
</code></pre>

And another example that includes handling of JPEGs as well:
<a href="http://markasread.net/post/17551554979/get-image-size-info-using-pure-python-code">http://markasread.net/post/17551554979/get-image-size-info-using-pure-python-code</a>

blocks|key|521520|text|我偶然发现了这一点，但只要导入numpy，就可以通过使用以下命令获得它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|521521|import+numpy+as+np

[y,+x]+=+np.shape(img[:,:,0])|code-block|syntax|javascript|521522|它之所以有效，是因为你忽略了除一种颜色之外的所有颜色，然后图像只是二维的，所以形状告诉你它是如何出价的。这对Python来说还是个新手，但似乎是一种简单的方法。|521523|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Stumbled upon this one but you can get it by using the following as long as you import numpy.

<pre><code>import numpy as np

[y, x] = np.shape(img[:,:,0])
</code></pre>

It works because you ignore all but one color and then the image is just 2D so shape tells you how bid it is. Still kinda new to Python but seems like a simple way to do it.

blocks|key|737998|text|它依赖于文件的输出，我不确定这在所有系统上都是标准化的。一些JPEG不报告图像大小|type|unstyled|depth|inlineStyleRanges|entityRanges|data|737999|import+subprocess,+re
image_size+=+list(map(int,+re.findall('(\d%2B)x(\d%2B)',+subprocess.getoutput("file"+%2B+filename))[-1]))|code-block|syntax|javascript|738000|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

It depends on the output of file which I am not sure is standardized on all systems. Some JPEGs don't report the image size

<pre><code>import subprocess, re
image_size = list(map(int, re.findall('(\d+)x(\d+)', subprocess.getoutput("file" + filename))[-1]))
</code></pre>

I am using Python 2.5. And using the standard classes from Python, I want to determine the image size of a file.

I've heard PIL (Python Image Library), but it requires installation to work.

How might I obtain an image's size without using any external library, just using Python 2.5's own modules?

Note I want to support common image formats, particularly JPG and PNG.

How to obtain image size using standard Python class (without using external library)?

Python

我使用的是Python 2.5。使用Python中的标准类，我想确定文件的图像大小。我听说过PIL (Python Image Library)，但它需要安装才能工作。如何在不使用任何外部库的情况下，仅使用Python2.5自己的模块来获取图像的大小？注意:我想支持常见的图像格式，特别是JPG和PNG。

问如何使用标准Python类(不使用外部库)获取图片大小？
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