在 bash 脚本中检测损坏的图像
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Detecting corrupted images in bash script
提问by skazhy
I have >2000 images from a webcam stream (for a time-lapse video), I need to delete all incomplete & corrupted images, before passing them to a php-gd script that edits them for the final video.
我有超过 2000 张来自网络摄像头流的图像（对于延时视频），我需要删除所有不完整和损坏的图像，然后再将它们传递给 php-gd 脚本，该脚本为最终视频编辑它们。
Is it possible to detect corrupted files with imagemagick or some other tool? If i try to open the corrupted image with feh it displays libpng error: Read Errorin console
是否可以使用 imagemagick 或其他一些工具检测损坏的文件？如果我尝试使用 feh 打开损坏的图像，它会显示libpng error: Read Error在控制台中
Thanks in advance!
提前致谢！
UPDATE:It seems that the suggested identify method accepts the bad images in my case. Here is an example of a corrupted one http://imgur.com/YcB9n
更新：在我的情况下，建议的识别方法似乎接受坏图像。这是一个损坏的示例http://imgur.com/YcB9n
采纳答案by dogbane
Try ImageMagick's identifycommand. From the man page:
试试 ImageMagick 的identify命令。从手册页：
Identify describes the format and characteristics of one or more image files. It will also report if an image is incomplete or corrupt.
标识描述一个或多个图像文件的格式和特征。它还会报告图像是否不完整或损坏。
Example:
例子：
$ identify foo.png
identify: NotAPNGImageFile (foo.png).
$ echo $?
1
An alternative, is to use PIL (Python Imaging Library):
另一种方法是使用PIL（Python 成像库）：
from PIL import Image
im = Image.open("foo.png")
im.verify()
From the documentation:
从文档：
im.verify()
Attempts to determine if the file is broken, without actually decoding the image data. If this method finds any problems, it raises suitable exceptions. This method only works on a newly opened image; if the image has already been loaded, the result is undefined. Also, if you need to load the image after using this method, you must reopen the image file.
验证（）
尝试确定文件是否损坏，而不实际解码图像数据。如果此方法发现任何问题，则会引发适当的异常。此方法仅适用于新打开的图像；如果图像已加载，则结果未定义。另外，如果使用此方法后需要加载图像，则必须重新打开图像文件。
回答by sarnold
I tried the ImageMagick identifycommand on a jpg I had laying around with several kinds of corruptions thrown in. It was able to identify some, but not all, so this might just be a partial solution at best, but try this:
我identify在一个 jpg 上尝试了 ImageMagick命令，我已经放置了几种类型的损坏。它能够识别一些，但不是全部，所以这充其量只是部分解决方案，但试试这个：
for f in *.JPG ; do identify $f > /dev/null || echo $f >> /tmp/fail ; done ; cat /tmp/fail
