# Ruby-exiv2 \\?

**URL:** <https://www.ruby-forum.com/t/ruby-exiv2/165318>\
**Category:** Ruby\
**Created:** [April 12, 2009, 3:57am UTC](https://www.ruby-forum.com/t/ruby-exiv2/165318 "2009-04-12T03:57:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![judge](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@judge](https://www.ruby-forum.com/u/judge)\
**Post date:** [April 12, 2009, 3:57am UTC](https://www.ruby-forum.com/t/ruby-exiv2/165318/1 "2009-04-12T03:57:23Z")

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I’m trying to use ruby-exiv2, the ruby bindings to the Exiv2 image  
metadata library. The docs are really sparse, though. In fact, this is  
it:

Basic usage:

> gem install RubyInline  
> gem install ruby-exiv2  
> irb -r rubygems

```
     require 'exiv2'
     @img = Exiv2::Image.new("a.jpg")
     puts @img["Exif.Photo.PixelXDimension"]
     @img["Exif.Photo.PixelXDimension"] = 2048
     @img.save

```

Version 1.3 introduces dynamic accessors:

```
 require 'exiv2'
 @img = Exiv2::Image.new("a.jpg")
 puts @img.Exif.Photo.PixelXDimension
     @img.Exif.Photo.PixelXDimension = 2048
     @img.save

```

There’s a list of tags in the exiv2 website (DateTimeOriginal, etc). But  
I’d really like to be able to make the ‘img’ object (to use the above  
example) give me a list of keys (or key-like tags) so I know what’s  
available (especially since not all images will have the same tags–for  
example, some will and some won’t have gps coordinates embedded).

Does anyone have any experience with ruby-exiv2? I couldn’t find a  
mailing  
list for it…

Paul