Expand image into banner

Branch logic

• If the user has not provided 來源圖, ask 用於 it before generating the final banner image.
• If a reference image is provided, preserve the subject identity, proportions, 和 important details before changing style 或 scene.
• If the first result fails 視覺 inspection, fix the smallest broken area first instead of regenerating the whole image.
• If the first tool path fails, switch to the next listed option: FLUX, GPT Image 2.

When not to use

• Do not use this as proof that the generated banner image is factually real 或 legally approved.
• Do not use it when the user needs professional legal, medical, safety, 或 regulated-compliance judgment.

• The final asset clearly matches the requested banner image.
• The main subject still reflects the original 來源圖.
• Text, hands, logos, edges, 和 產品細節 are not visibly broken.
• The result is usable in the target channel 且不 another full regeneration.