Color gradient from dark to light ratio

Quick answer：

A color gradient refers to a gradual transition of color from one shade to another. The 'ratio' in this context likely refers to the proportion of each color in the gradient. In design and art, the ratio of colors in a gradient can greatly affect the perceived depth, mood, and visual appeal. For example, a gradient with a higher ratio of darker colors at the bottom and lighter colors at the top creates a sense of depth, while a gradient with a more even distribution might be perceived as flatter.