In this video https://www.youtube.com/watch?v=LKnqECcg6Gw from about 1:15 it is stated that if you have an RGB value of (0.5,0.5,0.5) it is only 22% as bright as (1,1,1) rather than the expected 50% as bright.

Does this mean that RGB is adjusted for a logarithmic scale so that we perceive the (0.5,0.5,0.5) to be half as bright or have a misunderstood the video?

Despite searching around a lot I can not find any other source of information that discusses this.

Thanks heaps!

In this video from about 1:15, it is stated that if you have an RGB value of (0.5,0.5,0.5) it is only 22% as bright as (1,1,1) rather than the expected 50% as bright.

Does this mean that RGB is adjusted for a logarithmic scale so that we perceive the (0.5,0.5,0.5) to be half as bright, or have a misunderstood the video?

Despite searching around a lot I can not find any other source of information that discusses this.