HSB Colour Model (discs)

H = hue, S = saturation, and B = brightness in the HSB colour model?

The RGB colour model uses colour values that identify how much red, green and blue light is present in a colour. The HSB colour model uses colour values to identify the hue and the level of saturation and brightness.

Yes! Both RGB and HSB are additive colour models.

In the HSB colour model brightness (colour brightness) refers to the difference between the way a colour appears to an observer in well-lit conditions compared with its subdued appearance when in shadow or when poorly illuminated.