What is the HSY color space?
Inspired by the HSV and HSL color spaces and optimized for speed on embedded systems.
Why to code the Hue on 360° (9 bits) and so use a 16 bits word when you can code it on 256 values (8 bits)?
For computing saturation, we are using the HSV equation, faster to compute than the HSL one: S = (Max(R,G,B) - min(R,G,B)) / Max(R,G,B).
Finally, both Value and Lightness are not satisfying compared to a true luminance (they don’t use all three RGB components for their computation), so let’s use Y component since it is native from the camera.