identify parser does not handle a set, such as IPTC Keywords.

[cwholt]

using this code:

require 'tempfile'
require 'open-uri'
require 'micro_magick'

onion_url = "http://www.photometadata.org/sites/default/files/farmer_onion.jpg"

tf = Tempfile.new(%w{ onion_farmer .jpg })
tf.binmode
open(onion_url, {}) { |bits| tf.write(bits.read) }
final_cmd = "identify -verbose #{tf.path}"
stdout = Open3.popen3(final_cmd) do |stdin, stdout, stderr|
  stdout.read.strip
end
tf.close
tf.unlink
results = MicroMagick::IdentifyParser.new(stdout)
results[:profiles][:profile_iptc][:keyword_2_25_] # "Leeks"

However, this example file should have 45 keywords!

MicroMagick::IdentifyParser simply sets the last seen key

micro_magick/lib/micro_magick/identify_parser.rb

Line 32 in 5fd73cd

result[key] = value

but it should create an array.

[mceachen]

Thanks for the great report, and sorry for the response latency.

You should definitely look at the exiftool and exiftool_vendored gems. They work together so you have one less thing to worry about installing and upgrading on your servers. Graphicsmagick and Imagemagick's identify support is much less impressive when compared to exiftool (and the exiftool gem supports fetching multiple files in one call, which can be dramatically more efficient).

Here's your use case:

irb(main):001:0> require 'exiftool_vendored'
=> true
irb(main):002:0> Exiftool.new('farmer_onion.jpg').to_hash[:subject]
=> ["white", "outdoors", "vegetables", "male", "caucasian", "outside", "horizontal", "Person", "plants", "Agriculture", "Crops", "tractor", "outdoor", "conceptual", "organic", "farmer", "concept", "agronomy", "crop", "concepts", "abundance", "repetition", "granger", "farmhand", "farm hand", "field hand", "farm laborer", "field worker", "human", "human being", "human beings", "humans", "white person", "masculine", "30-55 years old", "onions", "vegetable crops", "agricultural equipment", "horizontals", "able-bodied", "farm fresh", "sustainable agriculture", "organic farming", "organics", "Leeks"]

I'll pull this now, though.

[mceachen]

I've just released v1.0.0 which greatly simplifies identify parsing to only support dimensions (which is required by the other functions. All the other attributes, like EXIF headers, were pretty hacky—no correct types, nesting was inconsistent, and paths changed across versions of ImageMagick and GraphicsMagick.

I've updated the README to point people to the exiftool and exiftool_vendored gems for this use case.