Module: Paleta::MagickDependent::ClassMethods

Defined in:
lib/paleta/palette.rb

Instance Method Summary collapse

Instance Method Details

#generate_from_image(path, size = 5) ⇒ Object 



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# File 'lib/paleta/palette.rb', line 13

def generate_from_image(path, size = 5)
  include Magick
  begin
    image = Magick::ImageList.new(path)

    # quantize image to the nearest power of 2 greater the desired palette size
    quantized_image = image.quantize((Math.sqrt(size).ceil ** 2), Magick::RGBColorspace)
    colors = quantized_image.color_histogram.sort { |a, b| b[1] <=> a[1] }[0..(size - 1)].map do |color|
      Paleta::Color.new(color[0].red / 256, color[0].green / 256, color[0].blue / 256)
    end
    return Paleta::Palette.new(colors)
  rescue Magick::ImageMagickError
    raise "Invalid image at " << path
  end
end