=== Green Screen Colours ===
On a green screen (where all colours are shades of unsaturated green), the colours (in BASIC colours), are in order of increasing intensity. Black is very dark, and white is bright green, and colour 13 is a medium green. (Thanks to [[Mark Rison|Mark Rison]] for this information)
The luminance (Y) is not exactly correlated to the actual luminance of colour images broadcast in RGB. We have other values.