ruby-processing: video capture w/ saturation filter

saturation1.rb

#!/usr/bin/env ruby

# only show pixels that pass a certain threshold of color saturation

class SaturationFilter < Processing::App

  load_library :video
  include_package "processing.video"
  
  def setup    
    smooth
    size(720, 576, P2D)
    @video = Capture.new(self, width, height, 30)     
  end

  def draw    
    @video.read if @video.available?
    image(@video, 0, 0)
    load_pixels
    black = color(0,0,0)
    pixels.each_with_index do |p,i| 
      pixels[i] = black unless [red(p), green(p), blue(p)].any? { |n| n > 80 }
    end
    update_pixels
  end
  
end