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  1. 10th Nov 2011 12:47 #31
    rallymax
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    Originally Posted by edDV View Post
    Green works much better than blue for YCbCr 4:2:0 camcorders. Y is mostly made up of Green and is full resolution. Blue is half resolution H&V and noisy.

    I assume you mention this because the storage mechanism (AVCHD etc) is YCrCb? (vs the Beyer RBG sensor)

    either way - yes I agree green is aways best - and often the least common color in the subject being filmed.
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  2. 10th Nov 2011 13:02 #32
    edDV
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    Originally Posted by rallymax View Post
    Originally Posted by edDV View Post
    Green works much better than blue for YCbCr 4:2:0 camcorders. Y is mostly made up of Green and is full resolution. Blue is half resolution H&V and noisy.

    I assume you mention this because the storage mechanism (AVCHD etc) is YCrCb? (vs the Beyer RBG sensor)

    either way - yes I agree green is aways best - and often the least common color in the subject being filmed.
    Yes any way you look at it green is the best chroma key color. The normal Bayer pattern has 2x green pixels giving green the better signal to noise. Y is mostly green @1920x1080. In a 4:2:0 recording format, blue is stored as mostly 960x540 resolution and will create stepped edges.

    Bayer pattern
    Name: 350px-Bayer_pattern_on_sensor_profile.svg.png Views: 152 Size: 7.1 KB

    Blue works equally well for film or 3x CCD 4:4:4 source only.
    Last edited by edDV; 10th Nov 2011 at 13:07.
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