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Nuke Keying with Key-light Tutorial by Anibrain School Of Media Design, Pune

‘Keying’ is one of those fundamental ‘compositing’ skills. You can’t composite anything until you have ‘mattes’ pulled for the elements you want to layer together. ‘Keylight’ is a ‘color difference keyer’, which means that for it to figure out a key, it compares every ‘pixel’ in the image against a single color, known here as the ‘Screen Color’.

‘Keylight’ is an industry-proven color difference keyer. The core algorithm was developed by the ‘Computer Film Company’ and has been further developed by ‘The Foundry’. To improve the key by firming up the foreground so the background doesn’t show through, you should adjust the ‘Clip White, Clip Black and Screen Matte’ etc options. ‘Reformat node’ lets you ‘re size’ and ‘reposition’ your image sequences to a ‘different format’. ‘Premult node’ multiplies the input’s ‘rgb’ channels by its ‘alpha’.

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