Nano Banana Pro 4K 商品攝影主圖（材質詞打光法）
免棚拍出 4K 電商主圖：材質詞（霧面、髮絲紋）加打光描述（柔光箱、補光、陰影）是質感關鍵。適合商品上架主圖、官網 hero 圖；小瑕疵用對話追改別重抽。
幫我生成一張商業級的產品攝影照。
【用途】這張圖要當[產品名稱]的官網主圖與電商主圖，必須像專業攝影棚拍出來的。
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產品攝影類的成敗八成在材質詞：「霧面」「髮絲紋金屬」「磨砂玻璃」這些詞的權重遠高於「高品質」「精美」這種空話。打光講清楚（柔光箱方向、補光、陰影）會讓圖立刻脫離 AI 感。4K 輸出是 Pro 的賣點之一，做電商主圖夠用。生成後別急著重抽——背景色不對、陰影太重這種小問題用對話追改就好，重抽反而會讓產品本體跑掉。
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