class ActiveStorage::Analyzer::ImageAnalyzer

Active Storage Image Analyzer¶ ↑

This is an abstract base class for image analyzers, which extract width and height from an image blob.

If the image contains EXIF data indicating its angle is 90 or 270 degrees, its width and height are swapped for convenience.

Example:

ActiveStorage::Analyzer::ImageAnalyzer::ImageMagick.new(blob).metadata
# => { width: 4104, height: 2736 }

# File activestorage/lib/active_storage/analyzer/image_analyzer.rb, line 15
def self.accept?(blob)
  blob.image?
end

# File activestorage/lib/active_storage/analyzer/image_analyzer.rb, line 19
def metadata
  read_image do |image|
    if rotated_image?(image)
      { width: image.height, height: image.width }
    else
      { width: image.width, height: image.height }
    end
  end
end