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Ron Martinsen's Photography Blog: TUTORIAL: Using Nik Software Color Efex Pro 4 & Special Offer
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Nik Collection - Episode 1: Color Efex Pro 4 - YouTube
Mastering the Nik Collection - 3: Color Efex Pro 4 - Photoshop Plugin & More! - YouTube
Nik Software Announces Color Efex Pro 4 | Popular Photography
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