StringIO 无法识别图像文件错误

Question

我正在使用以下代码在线检索图像：

import Image
import urllib2
import cStringIO

url = 'http://storage.googleapis.com/bloomsky-img/k65x5Kvpyc3W08jBqJ1kqZqnnZapoQ==.jpg'
img = urllib2.urlopen(url).read()
# error occurred when executing the line below
im = Image.open(cStringIO.StringIO(img))
im.verify()
# must reload the image after verify method !!
im = Image.open(cStringIO.StringIO(img))
im.save('name', 'JPEG')

当运行时，它给我 image not valid and error code is cannot identify image file <StringIO.StringIO instance at 0x7f6825b12e18> 错误。但是相同的代码在我的 mac 上运行完美。只有当我将代码部署到 Ubuntu 服务器时，我才遇到这样的问题。我检查了文档，我认为我正在以正确的方式使用 StringIO。有人可以帮忙吗？非常感谢。

Answer 1

我刚刚使用 pip install Pillow 在几乎全新的 Ubuntu 14.04 上安装了 Pillow。安装成功。但是，看看安装摘要：

    --------------------------------------------------------------------
    PIL SETUP SUMMARY
    --------------------------------------------------------------------
    version      Pillow 2.8.2
    platform     linux2 2.7.6 (default, Mar 22 2014, 22:59:56)
                 [GCC 4.8.2]
    --------------------------------------------------------------------
    *** TKINTER support not available
    (Tcl/Tk 8.6 libraries needed)
    *** JPEG support not available
    *** OPENJPEG (JPEG2000) support not available
    --- ZLIB (PNG/ZIP) support available
    *** LIBTIFF support not available
    *** FREETYPE2 support not available
    *** LITTLECMS2 support not available
    *** WEBP support not available
    *** WEBPMUX support not available
    --------------------------------------------------------------------
    To add a missing option, make sure you have the required
    library, and set the corresponding ROOT variable in the
    setup.py script.
    To check the build, run the selftest.py script.
    changing mode of build/scripts-2.7/pilconvert.py from 644 to 755
    changing mode of build/scripts-2.7/pildriver.py from 644 to 755
    changing mode of build/scripts-2.7/pilfile.py from 644 to 755
    changing mode of build/scripts-2.7/pilprint.py from 644 to 755
    changing mode of build/scripts-2.7/pilfont.py from 644 to 755
    changing mode of [...]
Successfully installed Pillow-2.8.2

看到那边的*** JPEG support not available了吗？我认为这是关键...

Answer 2

您必须倒带您的 stringIO 对象 - 只需在验证之前调用 im.seek(0)，在 Image.open 之前（并将 im 也传递给它 - 不需要创建另一个 stringIO 对象）；

StringIO 无法识别图像文件错误

StringIO Cannot Identify Image File Error

python

image

stringio

python-imaging-library

pillow