Online Editing | Keying

Keying: proses menyeleksi suatu objek pada gambar dengan cara mengeliminasi berdasarkan satu warna tertentu untuk mendapatkan alpha channel.

Matte/alpha channel/front/fill: objek yang terseleksi/telah dipisahkan sehingga bisa dikomposisikan ke gambar lain (compositing). Alpha channel/matte divisualisasikan sebagai hitam putih untuk memisahkan dengan background hijau (yang warna putih akan terlihat, yang warna hitam akan hilang).

Green screen punya diferensial yang baik jika dalam satu gambar yang memiliki informasi warna hijau hanya green screen tersebut. Diferensial yang baik akan menentukan mudah/sulitnya proses keying/compositing. Suatu warna tertentu, misalnya hijau memiliki range gelap & terang yang diambil sebagai matte. Terkadang, tidak semua terseleksi sehingga harus menyeleksi sendiri bagian warna agar menjadi clean.

(Sumber: pluralsight.com)

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