请你将这张照片人像背景换为纯蓝色 并压缩至长宽比为640：480像素

{ "prompt": "Change the background of the provided photo to a solid pure blue color while preserving the person in the foreground. Then resize the final image to exactly 640x480 pixels (4:3 aspect ratio).", "size": "640x480", "n": 1, "referenced_image_ids": ["/mnt/data/IMG_20260413_225642.jpg"] }

{"prompt":"Take the existing portrait of the young East Asian man against a solid blue background and resize it to exactly 480×640 pixels (portrait orientation). Export it as a compressed JPEG with file size no more than 30 KB, while keeping the current colors and clarity of the blue background and the subject intact.","size":"480x640","transparent_background":false,"is_style_transfer":false,"n":1}