Towards Better Chroma Subsampling - SMPTE Presentation Notes
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Out of range/gamut colors

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Original values    
Y’ 0.2126 0
B’-Y’ -0.2126 0
R’-Y’ 0.7874 0
Subsampled values    
Y' 0.2126 0
B'-Y' -0.1063 -
R'-Y' 0.3937 -
R'G'B' values    
R' 0.6063 0.3937
G' 0.1063 -0.1063
B' 0.1063 -0.1063