Aircraft blue colour
The RGB colour model is an additive model in which the red, green, and blue primary colors of light are added together to reproduce a broad spectrum of colours. In the case of , using 8-bit 0–255 values for each channel, it is red 23, green 54, blue 121.
The CIELAB color space expresses color as three values: L* for perceptual lightness, and a* and b* for the colours of human vision: red-green, blue-yellow.
Aircraft blue is from the British colour standard BS 381.