Using RMagick to extract IPTC data from JPEG file


#1

Hi all,

I’m relatively new to Ruby and RMagick. I want to extract IPTC
information from JPEG files. Elements that I’ve already found are :

From RMagick, iptc_profile :
http://www.simplesystems.org/RMagick/doc/imageattrs.html#iptc_profile

And

This, but it doesn’t seem to work for :
http://studio.imagemagick.org/pipermail/magick-users/2004-July/013122.html

Anyone can give me some information ?

Thank you all.


#2

Send a JPEG with an IPTC profile in it to rmagick AT rubyforge DOT org
and I’ll take a look at it.


#3

Before sending you an image, I want to try by myself :slight_smile:

Can you just give me some indications on how-to achieve such a process
in Ruby with RMagick ? (if RMagick implements such features)

What I want is extracting some of these information : caption,
headline, copyright_string, etc.

Thank you,
Jérémy


#4

It’s Ok, I’ve just found it!

RMagick can access IPTC values, via the method
get_exif_by_entry([name]).

That was too easy! :smiley:

Thank you for your proposale!

Jérémy


#5

RMagick simply provides an interface to the ImageMagick API. The doc
for the iptc_profile attribute tells you everything I know about it. If
you send me an example image I will try it myself and communicate with
the ImageMagick developers if necessary.


#6

Oups! I was wrong finally. get_exif_by_entry only returns EXIF
information, eheh dumb! :smiley:

So, is there any way with RMagick to extract, keywords, city, province,
country, etc.

Jérémy


#7

Jérémy wrote:

So, is there any way with RMagick to extract, keywords, city, province,
country, etc.
The iptc_profile attribute of the Image class. (see post of rmagick!)

Jan

btw: rmagick AT rubyforge DOT org is the official e-mail address for the
RMagick project. They want to help you.


#8

I’m currently working on it! Writing a class to format the binary IPTC
string returned by RMagick.


#9

Ok, I’ve realesed a first version :
http://www.blogthatweb.com/2006/02/22/ruby-on-rails-iptc-extraction-plugin/

Jérémy