Growing an image past its border without a visible seam

You have a photo and you want more of it. More sky above the head, more room to the left of the subject, a wider frame than the camera gave you. Outpainting is the name for inventing those new pixels. The model part is well covered everywhere. The part nobody talks about is the few dozen lines that run before the model, and that part is where the seam is won or lost. If you get the prep wrong, the new region meets the old photo at a hard line. The colors step. The texture changes mid-wall. You…