Most AI poster makers stop at a flat image. You get something that looks like a poster, but the headline is painted into the pixels, so every small copy change turns into a new generation. That is fine for a mood board and painful for a real campaign.
This poster workflow starts with GPT Image 2 for the visual direction, then hands the result to a browser PSD layout studio. The studio places your title and body copy as real text layers, so the exported file keeps an editable headline and an editable paragraph instead of flattening everything.
Use it for film posters, launch graphics, event announcements, sale windows, and social covers. You can begin with a prompt when the direction is open, or upload a reference image when the composition already exists and you need a stronger version.