ruby-on-rails – Paperclip – 图像上传错误：“’identify’命

例如,如果用户选择文本文件,验证通过但最终会出现此错误：

5 errors prohibited the profile update:

Profile pic content type is not one of image/jpeg,image/png,image/gif
Profile pic /var/folders/lF/lF0Ne5vGFj44kV54W3zBdU+++TI/-Tmp-/stream20101118-229-17xuiu4-0.js is not recognized by the 'identify' command.
Profile pic /var/folders/lF/lF0Ne5vGFj44kV54W3zBdU+++TI/-Tmp-/stream20101118-229-17xuiu4-0.js is not recognized by the 'identify' command.
Profile pic /var/folders/lF/lF0Ne5vGFj44kV54W3zBdU+++TI/-Tmp-/stream20101118-229-17xuiu4-0.js is not recognized by the 'identify' command.
Profile pic /var/folders/lF/lF0Ne5vGFj44kV54W3zBdU+++TI/-Tmp-/stream20101118-229-17xuiu4-0.js is not recognized by the 'identify' command.

至少第一个错误是指文件类型.但是如果用户上传了一些更具体的文件,比如.PXM,那么Rails表现得很奇怪,并显示：

4 errors prohibited the profile update:

Profile pic /var/folders/lF/lF0Ne5vGFj44kV54W3zBdU+++TI/-Tmp-/stream20101118-229-1scwkg7-0.pxm is not recognized by the 'identify' command.
Profile pic /var/folders/lF/lF0Ne5vGFj44kV54W3zBdU+++TI/-Tmp-/stream20101118-229-1scwkg7-0.pxm is not recognized by the 'identify' command.
Profile pic /var/folders/lF/lF0Ne5vGFj44kV54W3zBdU+++TI/-Tmp-/stream20101118-229-1scwkg7-0.pxm is not recognized by the 'identify' command.
Profile pic /var/folders/lF/lF0Ne5vGFj44kV54W3zBdU+++TI/-Tmp-/stream20101118-229-1scwkg7-0.pxm is not recognized by the 'identify' command.

有谁知道这里发生了什么？我的模型中有以下代码：

validates_attachment_content_type :profile_pic,:content_type=>['image/jpeg','image/png','image/gif']

…以及此回形针初始化程序：

Paperclip.options[:command_path] = "/opt/local/bin/"

ImageMagik似乎已正确安装和设置：

$which Magick-config
/opt/local/bin/Magick-config

谢谢！