海报渐变效果

Quick answer：

The term '海报渐变效果' refers to a visual effect in poster design where colors or images gradually transition or blend from one to another. This technique is used to create a sense of depth, movement, or harmony in the design. In graphic design, gradient effects can be achieved through various software tools like Adobe Photoshop or Illustrator, and they are widely used in advertising, branding, and digital media.