# 背景置換

Replace the weather and sky in the background with a soft overcast rainy-day atmosphere. Add a uniformly gray cloud-covered sky, light wet sheen on visible ground surfaces, faint diagonal rain streaks at low density, and slightly cooler ambient color temperature consistent with diffused daylight. The subject should remain dry and unaffected — do not add wet hair or rain droplets on the person. Keep identity, hairstyle, hair length, hair color, bangs, clothing color, clothing fit, pose, and facial expression intact. No white halo around the subject and no color cast on the skin from the new background. Do not regenerate the photo from scratch — only operate on the existing pixels and preserve every face, pose, and texture exactly as the source. Output at the original resolution. Photorealistic and natural-looking.

Replace the background of the uploaded photo with a softly blurred professional photography studio backdrop in neutral light gray (#D8D8D8), with subtle vignetting toward the corners. Keep the person's pose, facial expression, hair flyaways, and clothing exactly as in the original. Do not change the hairstyle, hair length, or hair color. Match the existing key-light direction and 5500K color temperature on the subject so the composite looks natural. Output as a 1:1 square at 1024×1024 pixels. Photorealistic and natural-looking, with no white halo around the subject and no color cast on the skin from the new background.