How to get an image's EXIF information using CarrierWave?

You can ask Cloudinary to return your image's metadata and colors in a response either while uploading or while using our Admin API for already-uploaded images.

For more information regarding extracting image metadata in Rails, please refer to this blog post.

For server-side uploads you can use the following:
cloudinary_transformation :image_metadata=>true.
For example:

class PictureUploader < CarrierWave::Uploader::Base

  include Cloudinary::CarrierWave

  process :convert => 'png'
  cloudinary_transformation :image_metadata=>true
  # ...
end

For client-side uploads, simply add the parameter :image_metadata=>true to the cl_image_upload_tag.
For example:

cl_image_upload_tag(:image_id, :image_metadata=>true).

To access the returned metadata after uploading, you can add the following code for processing metadata returned by Cloudinary to your ActiveRecord model entity. Please make sure after_save is placed after the mount_uploader definition:

  after_save :check_metadata

  def check_metadata
    if self.picture.present? && self.picture.metadata.present?
      exif = self.picture.metadata["image_metadata"]
      # ...
    end
  end

For more information on the CarrierWave integration, please refer to the CarrierWave integration reference.