Red brightness gradient

Quick answer：

A red brightness gradient refers to a gradual change in the brightness of the color red, often seen in digital images or graphical interfaces. It is used to create visual effects, highlight areas, or indicate a range of values. In color theory, a gradient is a smooth transition between colors, and in the case of a red brightness gradient, the color's luminosity (lightness or darkness) changes uniformly across a spectrum of red shades.