画像のsepiaエフェクトを作るために、R,G,Bを微妙に混ざったら簡単にできる
sepia.rb
finalRed= (R * 0.393) + (G * 0.769) + (B * 0.189)
finalGreen = (R * 0.349) + (G * 0.686) + (B * 0.168)
finalBlue= (R * 0.272) + (G * 0.534) + (B * 0.131)
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