Module: Imogen::Iiif::Quality

Defined in:
lib/imogen/iiif.rb

Constant Summary collapse

VALUES = 
[:native, :color, :grey, :bitonal]

Class Method Summary collapse

Class Method Details

.convert(img, quality) ⇒ Object 



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# File 'lib/imogen/iiif.rb', line 30

def self.convert(img, quality)
  q = get(quality)
  if q == :grey
    img.convert_to_greyscale {|c| yield c}
  elsif q == :bitonal
    img.threshold(128) {|c| yield c}
  else
    yield img
  end
end

.get(quality = :native) ⇒ Object

Raises:



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# File 'lib/imogen/iiif.rb', line 25

def self.get(quality=:native)
  q = (quality || :native).to_sym
  raise BadRequest.new("bad quality #{quality}") unless VALUES.include? q
  return (q == :native or q == :color) ? nil : q
end