ruby-on-rails – Spree中的Paperclip :: NotIdentifiedByImageM

Paperclip::NotIdentifiedByImageMagickError in Spree::Admin::ImagesController#create

    Command :: identify -format %wx%h :file
[paperclip] An error was received while processing: #<Paperclip::NotIdentifiedByImageMagickError: /var/folders/fq/9g_6hmg513g6137rb6sbghw00000gn/T/stream20121005-26943-16883d4.png is not recognized by the 'identify' command.>

Paperclip::NotIdentifiedByImageMagickError (/var/folders/fq/9g_6hmg513g6137rb6sbghw00000gn/T/stream20121005-26943-16883d4.png is not recognized by the 'identify' command.):
  paperclip (2.7.1) lib/paperclip/geometry.rb:29:in `from_file'
  spree_core (1.2.0) app/models/spree/image.rb:35:in `find_dimensions'
  activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `_run__1794851703999987262__post_process__1580526166879208018__callbacks'

当我从命令行运行识别时,我得到以下输出

Image Settings:
  -alpha option        on,activate,off,deactivate,set,opaque,copy
                       transparent,extract,background,or shape
  -antialias           remove pixel-aliasing
  -authenticate password
                       decipher image with this password
  -channel type        apply option to select image channels
  -colorspace type     alternate image colorspace
  -crop geometry       cut out a rectangular region of the image
  -define format:option
                       define one or more image format options
  -density geometry    horizontal and vertical density of the image
  -depth value         image depth
  -extract geometry    extract area from image
  -features distance   display image features (e.g. contrast,correlation)
  -format "string"     output formatted image characteristics
  -fuzz distance       colors within this distance are considered equal
  -gamma value         of gamma correction
  -interlace type      type of image interlacing scheme
  -interpolate method  pixel color interpolation method
  -limit type value    pixel cache resource limit
  -monitor             monitor progress
  -ping                efficiently determine image attributes
  -quiet               suppress all warning messages
  -regard-warnings     pay attention to warning messages
  -respect-parentheses settings remain in effect until parenthesis boundary
  -sampling-factor geometry
                       horizontal and vertical sampling factor
  -seed value          seed a new sequence of pseudo-random numbers
  -set attribute value set an image attribute
  -size geometry       width and height of image
  -strip               strip image of all profiles and comments
  -unique              display the number of unique colors in the image
  -units type          the units of image resolution
  -verbose             print detailed information about the image
  -virtual-pixel method
                       virtual pixel access method

Image Operators:
  -negate              replace every pixel with its complementary color 

Miscellaneous Options:
  -debug events        display copious debugging information
  -help                print program options
  -list type           print a list of supported option arguments
  -log format          format of debugging information
  -version             print version information

By default,the image format of `file' is determined by its magic
number.  To specify a particular image format,precede the filename
with an image format name and a colon (i.e. ps:image) or specify the
image type as the filename suffix (i.e. image.ps).  Specify 'file' as
'-' for standard input or output.

任何帮助将不胜感激.

谢谢,
科里