How to Retrieve Exif Information of an Image in Rails

How to retrieve EXIF information of an image in Rails

Did you give exifr gem a try? From the documentation

EXIFR::JPEG.new('IMG_6841.JPG').width               # => 2272
EXIFR::JPEG.new('IMG_6841.JPG').height              # => 1704
EXIFR::JPEG.new('IMG_6841.JPG').exif?               # => true
EXIFR::JPEG.new('IMG_6841.JPG').model               # => "Canon PowerShot G3"
EXIFR::JPEG.new('IMG_6841.JPG').date_time           # => Fri Feb 09 16:48:54 +0100 2007
EXIFR::JPEG.new('IMG_6841.JPG').exposure_time.to_s  # => "1/15"
EXIFR::JPEG.new('IMG_6841.JPG').f_number.to_f       # => 2.0

How to retrieve EXIF information of an ActiveStorage image in Rails

If you have a user with avatar maybe ou have a class like that

class User < ApplicationRecord
  has_one_attached :avatar
end

To get a exif info you can run this:

user = User.find 1
MiniMagick::Image.open(user.avatar).exif 

A gem that you need:

gem "mini_magick"

More about MiniMagick

How do I read the exif data from an image being attached by paperclip?

Try changing the first line in your load_exif method to:

exif = EXIFR::JPEG.new(photo.queued_for_write[:original].path)

Without .path on the end, I don't believe it's returning the file path.

Rails 5.2 ActiveStorage save and then read Exif data

I think you want to use a variant when displaying the image rather than trying to edit the stored image. To fix the orientation, you could say:

user.avatar.variant(auto_orient: true)

And if you want to do several operations at once (rather than in a pipeline), use combine_options:

user.avatar.variant(combine_options: {
  auto_orient: true,
  gravity:     'center',
  resize:      '23x42',    # Using real dimensions of course.
  crop:        '23x42+0+0'
})

The edited image will be cached so you only do the transformation work on first access. You might want to put your variants into view helpers (or maybe even a model concern depending on your needs) so that you can isolate the noise.

You might want to refer to the API docs as well as the guide:

• ActiveStorage::Variant
• ActiveStorage::Variation

Rails ActiveStorage strip image EXIF data

based on iGian's comment I ended up with this code:

before_save :strip_exif_data

private

def strip_exif_data
  return unless image.attached?
  filename = image.filename.to_s
  attachment_path = "#{Dir.tmpdir}/#{image.filename}"
  File.open(attachment_path, 'wb') do |file|
    file.write(image.download)
    file.close
  end
  mm_image = MiniMagick::Image.open(attachment_path)
  mm_image.strip
  mm_image.write attachment_path
  image.attach(io: File.open(attachment_path), filename: filename)
end

Getting GPS metadata from a picture with Paperclip

What you need is being able to extract EXIF information from the picture.

There is a gem that aims to do just that: exifr

You can install it automatically with the following bundler line:

gem 'exifr'

EDIT:

I have personally switched to this fork of the same gem, which contains GPS helpers:

gem 'exifr', :git => 'git://github.com/picuous/exifr.git'

Use example:

EXIFR::JPEG.new('IMG_6841.JPG').gps?                # => true
EXIFR::JPEG.new('IMG_6841.JPG').gps                 # => [37.294112,-122.789422]
EXIFR::JPEG.new('IMG_6841.JPG').gps_lat             # => 37.294112
EXIFR::JPEG.new('IMG_6841.JPG').gps_lng             # =>-122.789422

How to get EXIF keywords using mini_magick in a Rails app?

EXIF metadata is created by camera, therefore it contains only technical related stuff. What you actually want to access is IPTC and XMP.

Imagemagick, which is behind mini_magick, allows to read IPTC, e.g. image["%[IPTC:2:25]"] for keywords (update: be aware of perfomance issues, see comments).

As for XMP, I don't know an easy way to do this. You can try to run

`identify -verbose #{your_filename}`

and then grub lines that include xmp.

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