入力

「商品写真の背景を白から京都の和室に変えたい、OmniGen で」

OmniGen 2 用に最適化された出力

Edit mode prompt:

Take the input image and replace the plain white background with a
traditional Japanese washitsu interior featuring tatami mat flooring,
shoji paper sliding doors with soft diffused natural light filtering
through from the left, and a low wooden table base.

Keep the product itself completely identical — same color, texture,
position, scale, lighting on the product, and shadow direction. Only
the background and ambient context should change. Maintain the same
camera angle and focal length compression so the product perspective
remains undistorted.

Match the new background lighting to the existing product lighting:
warm 4000K with soft directional light from upper left, gentle
shadows. Add a subtle floor reflection where the product meets the
tatami.

ComfyUI OmniGen ノードに入力画像をロード、上記プロンプトで CFG 3.5 / Step 50 実行。 マスク不要で背景差し替え完了。