Paperclip / Passenger NotIdentifiedByImageMagickError: - ruby-on-rails

Question

When I try to upload a photo in Ruby on Rails using Paperclip on my local machine it works perfectly.
When I try to upload a photo in Ruby on Rails using Paperclip on our Linux (CentOS 5.2) server with Apache and Phusion Passenger, I get:
2 errors prohibited this user from being saved
There were problems with the following fields:
- Avatar /tmp/stream20091026-21120-1qdbnul-0 is not recognized by the 'identify' command.
- Avatar /tmp/stream20091026-21120-1qdbnul-0 is not recognized by the 'identify' command.
I tried adding:
Paperclip.options[:command_path] = "/usr/local/bin"
to production.rb but it didn't make a difference.
In the log files I get the following errors:
Parameters: {"commit"=>"Upload",
"action"=>"update", "_method"=>"put",
"authenticity_token"=>"419410afc22737cd2f6b6096a95327db76a48ba9",
"controller"=>"users",
"user"=>{"avatar"=>#}}
[paperclip] Saving attachments.
[paperclip] An error was received
while processing:
/tmp/stream20091026-20752-1g568yk-0 is
not recognized by the 'identify'
command.

Answer 1

Identify is a command-line utility inside the ImageMagick package.
From its homepage:
The identify program describes the
format and characteristics of one or
more image files. It also reports if
an image is incomplete or corrupt. The
information returned includes the
image number, the file name, the width
and height of the image, whether the
image is colormapped or not, the
number of colors in the image, the
number of bytes in the image, the
format of the image (JPEG, PNM, etc.),
and finally the number of seconds it
took to read and process the image.
Many more attributes are available
with the verbose option.
First, copy the image on the server and run the identify command on it. You should receive something like:
identify ~/capture.jpg
capture.jpg JPEG 1216x244 1216x244+0+0 8-bit DirectClass 97.7kb
If you receive an error, try upgrading the ImageMagick package on your server. You may find an updated binary release here:
http://www.imagemagick.org/script/binary-releases.php

Answer 2

in my case with same error, reinstalling imagemagic helped out (ubuntu 12.10)