Note that this is a twofold manifestation: the human eye perceives brightness in a nonlinear manner, and physical output devices (such as CRTs and LCDs) display brightness nonlinearly.

• 请注意，这种现象表现在两方面：人眼对亮度的感受是非线性的，而物理输出设备（例如CRT和LCD）对亮度的显示也是非线性的。