mdsh.com/wiki

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		+	609 (SD) or 709 (HD) matrices when encoding component from RGB:
		+
		+	{{{601 y = 0.299 * r + 0.587 * g + 0.114 * b}}}
		+
		+	{{{709 y = 0.213 * r + 0.715 * g + 0.072 * b}}}