Class: ActiveAnalysis::Analyzer::ImageAnalyzer

Inherits:
ActiveAnalysis::Analyzer show all
Defined in:
lib/active_analysis/analyzer/image_analyzer.rb

Overview

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:

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

Direct Known Subclasses

ImageMagick, Vips

Defined Under Namespace

Classes: ImageMagick, Vips

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.accept?(blob) ⇒ Boolean

Returns:

  • (Boolean) 


15
16
17
 
# File 'lib/active_analysis/analyzer/image_analyzer.rb', line 15

def self.accept?(blob)
  blob.image?
end

Instance Method Details

#metadata ⇒ Object 



19
20
21
22
23
24
25
26
27
 
# File 'lib/active_analysis/analyzer/image_analyzer.rb', line 19

def metadata
  read_image do |image|
    if rotated_image?(image)
      { width: image.height, height: image.width, opaque: opaque?(image), **addons(image) }.compact
    else
      { width: image.width, height: image.height, opaque: opaque?(image), **addons(image) }.compact
    end
  end
end