Appropriate gradient color for posters

Quick answer：

When choosing a gradient color for posters, it is important to select hues that are visually appealing and convey the intended message or theme. Gradient colors can create depth and interest on the poster. It's advisable to choose a color palette that includes a base color, a mid-color, and an accent color. The base color should be dominant, the mid-color should transition smoothly to the accent color, which can add emphasis to key elements of the poster. Consider the emotional tone you want to evoke and the readability of the text on the poster when selecting gradient colors.