更换图像背景时，需保持原始结构、透视与主体不变。将背景替换为[新背景]，融入符合场景的真实元素、景深和光照效果，确保前景与背景自然融合，同时保留图像的整体情绪、氛围与协调性。
Want a different result? Change just a few parts
AI finds the swappable parts (subject/style/scene) — fill in what you want, keep the rest
