I built a RGB LED Display and at first implemented brightness levels by just PWM modulating in a linear way. I quickly found out that it was lacking in dark sha

I built a RGB LED Display and at first implemented brightness levels by just PWM modulating in a linear way. I quickly found out that it was lacking in dark shades or that the bright shades were almost indiscernible. The solution was gamma correction which made the shades look distributed evenly across the brightness range.