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Openai/694f5245-1110-800b-b182-7c2accd50046
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==== 如果你手上已經有很多黑底/白底貼紙素材，不想每張去背，那就逼 GEMINI 做 chroma key 透明（把某個顏色視為透明）。 ==== 這招在 HTML Canvas 超有效：先把圖片 draw 到 offscreen canvas，再把 key color 的 alpha 設為 0。 你在 prompt 裡指定「#000000 透明」或「#FFFFFF 透明」就行。 你甚至可以更硬派一點：統一規格：素材都用純綠(#00FF00)當底色，再做綠幕去背，成功率更高😂
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