AI Glossary
Outpainting
Also called generative expand
What does “Outpainting” mean?
Outpainting: Extending an image beyond its original borders. The model invents new content around the edges that continues the scene, matching its style, lighting and perspective. It is closely related to inpainting, except the masked area lies outside the original canvas.

What is an example of “Outpainting”?
Turning a tightly cropped square portrait into a wide landscape image for a website banner by generating the missing background on both sides.