Background image gradient in poster

Quick answer：

A background image gradient in a poster refers to a visual technique where the colors of an image gradually transition from one color to another. This creates a smooth and aesthetically pleasing transition that can enhance the overall design of the poster. Gradient backgrounds are commonly used in graphic design to add depth, draw attention, or to blend elements seamlessly. They can be created using various software tools such as Adobe Photoshop or Illustrator.