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Why is the blue color of sky darker in high altitude regions?

Why is the blue color of sky darker in high altitude regions?

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1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
8 years ago
All colors (wavelengths) that make up the "blue" sky are "darkened" with altitude in (approximately) the same proportion because there is lass air to scatter. However, the brain doesn't directly perceive how much red, green, and blue there is. The brain transforms this information into something like the "HCL" color space. "H" means "Hue"; different colors on the rainbow are different hues. "C" means "chroma", low chroma colors are washed out, zero chroma means shades of grey. "L" means luminosity, on a scale of dark vs light. If the red,green, and blue components are all reduced we notice less "L" but the same "H" and "C" (as long as it stays bright enough for cones to work).
Thanks and Regards
Apoorva Arora
IIT Roorkee
askIITians Faculty

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