Extend a Photo to a New Aspect Ratio

Plan an outpaint to change aspect ratio without inventing a new subject. IMAGE Current and target aspect: [FROM → TO] Where the extra canvas goes: [LEFT | RIGHT | TOP | BOTTOM] What is at that edge now: [SKY | WALL | TABLE | CROWD] What must not be invented: [EXTRA PEOPLE, EXTRA PRODUCTS, TEXT, LIMBS] Tool: [GENERATIVE FILL | OTHER] PLAN 1) The canvas extension in pixels or percent, and a margin of original pixels that the fill may blend across. 2) The prompt for the fill, boring on purpose: continue the surface, match the light, no new subject. One prompt per edge if two edges differ. 3) Failure signs: a repeated pattern, a new window, a hand, a horizon that bends. What to keep from the original by masking. 4) A version that solves it by cropping or by a designed color field instead of generative fill, and when that is the better choice (a logo, a face near the edge, a legal image). 5) Export named so nobody confuses the extended file with the original. Do not extend a frame to add a person who was not there.