sample = [
[[65, 67, 23], [234, 176, 0], [143, 0, 0]],
[[255, 30, 51], [156, 41, 38], [3, 243, 176]],
[[255, 255, 255], [0, 0, 0], [133, 28, 13]],
[[26, 43, 255], [48, 2, 2], [57, 89, 202]]
]

fsample = sample.flatten(1)

for (r, g, b) in sample.flatten(1)
  puts "(" + r.to_s + "," + g.to_s + "," + b.to_s + ")"
  if (r >= 100 and g <= r/4 and b <= r/4)
      puts "IS RED"
  end
end

puts ""

sample.flatten(1).select{|r, g, b| r >= 100 and g <= r/4 and b <= r/4}.each{|r, g, b| puts "(" + r.to_s + "," + g.to_s + "," + b.to_s + ") IS RED"}