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> most luminous color What does luminous mean exactly in this context? I know that our eyes are most sensitive to green. For example a green LED needs less po
by _nalply 3y ago
> most luminous color
What does luminous mean exactly in this context?
I know that our eyes are most sensitive to green. For example a green LED needs less power to seem as bright as a red LED.
But our eyes don't matter in this subject. So I am scratching my head about what you mean that green is the most luminous color?
- MayeulC 3y agoI think this is the color (wavelength) that corresponds to the sun's emissivity peak (irradiance in W/m²). The fact that our eyes are most sensitive to green is probably not an accident, but is it due to the color of leaves, or is it due to sunlight?
- austin-cheney 3y agoHere is the math used by W3C for computing acceptable contrast: https://www.w3.org/TR/WCAG20/#relativeluminancedef https://www.w3.org/TR/WCAG20/#relativeluminancedef I suspect luminosity to mean percentage of brightness for a given frequency from a total light source assuming white light. For a more precise definition I would look to physics.
- buildartefact 3y agoThat’s for sRGB, which as for most colour spaces is defined relative to CIE XYZ, which is itself defined in terms of the perception of a “standard human observer”. In XYZ, the Y coordinate is the luminance (brightness) of the colour and that first equation is computing Y from the RGB value