Lesson 2 of 6
Generative fill and expand
6 min read
There's a wine glass photobombing your perfect shot. Or your photo is too narrow for the banner you need. Instead of starting over, what if you could just point at the problem and have the tool fix that one spot?
Point at a spot, describe the fix
The single most useful AI edit is also the easiest to picture. You draw over a part of the image — a stray object, an empty patch of wall — describe what should be there instead, and the tool repaints only that spot to match. Everything else stays exactly as it was. In most apps this button is called generative fill. It's how you delete a photobomber, add a plant to a bare corner, or swap someone's shirt without touching the rest of the picture.
Generative fill repaints just the area you select, from a short description, and leaves the rest of the picture untouched — so you fix one thing instead of remaking everything.
The same trick, pointed outward
Now flip it around. Instead of filling a spot inside the picture, you can extend the picture past its edges — the tool invents what would have been just outside the frame. That's how a tight square becomes a wide banner, or a cropped-too-close portrait gets its head and shoulders back. Filling inside is generative fill; growing outward like this is called outpainting (some apps just label it Expand).
Outpainting grows a picture beyond its original edges, inventing what lies just outside the frame — the same fill-in idea aimed outward, perfect for reshaping an image to a new size.
When to reach for it
The rule of thumb is simple. If a picture is almost right and one part is wrong, don't regenerate the whole thing and gamble away the parts you liked — fill just the bad spot. If a picture is right but the wrong shape or too tight, expand it instead of cropping something else away.
Fill covers a multitude of sins: remove tourists from a landmark, erase a date stamp, tidy a messy desk behind you, or drop a product onto a blank patch. If you can point at it, you can fill it.
The gist
- —Generative fill repaints only the area you select, from a short description — the rest stays untouched
- —Outpainting (or Expand) grows the picture beyond its edges, inventing what's just outside the frame
- —Fill a spot when one part is wrong; expand when the picture is the wrong shape or too tight
Your group photo is perfect, except a rubbish bin in the background ruins the corner. What's the cleanest fix?
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