xmp - Extensible Metadata Platform (XMP) parser

MP provides object oriented interface to XMP data. XMP data can be found in PDF, JPEG, GIF, PNG, and many other formats.

Supported Formats

Format	File extension	Additional dependency
JPEG	.jpeg, .jpg	exifr/jpeg
TIFF	.tiff, .tif	exifr/tiff
XMP Files	.xmp, .xml	none

Usage

require 'xmp'
xmp = XMP.new('example.jpg')
xmp.dc.subject # => ["something interesting"]

xmp.namespaces.each do |namespace|
  xmp[namespace].attributes.each do |attribute|
    puts "#{namespace}.#{attribute}: #{xmp[namespace][attribute].inspect}"
  end
end

XMP.new accepts:

Paths to files (it will choose based on file extension)
File objects (it will choose based on file extension)
Nokogiri documents or XML strings

Attributes can be accessed in the following ways:

# assuming an XMP entry AttributeName within the NamespaceName namespace, these are all equivalent
xmp['NamespaceName']['AttributeName']
xmp.namespace_name.attribute_name
xmp.NamespaceName.AttributeName

# you can also mix them
xmp.namespace_name['AttributeName']

# or convert the data to an actual hash
xmp.to_h # => { 'NamespaceName' => { … }, … }

Installation

$ gem install xmp
$ gem install exifr # optional, for jpeg/tiff support

Or you can add it to your Gemfile:

gem 'xmp',   '~> 0.3'
gem 'exifr', '~> 1.3'

Requirements

Ruby 2 or Ruby 3
Nokogiri (1.10 or newer, gem dependency - will be installed automatically)
EXIFR (1.3 or newer) - optional

Development

Fork it at https://github.com/amberbit/xmp

$ bundle install # install development dependencies
$ rake spec      # run specs

License

Ruby's license.