Film Noir vs Duotone黑色电影（Film Noir） 对比 双色调（Duotone）
How to tell them apart: the deciding signals, and the exact changes that would turn one into the other. 怎么分清这两个：判别信号，以及一个变成另一个需要的具体改动。
Film Noir黑色电影（Film Noir）
Duotone双色调（Duotone）
This is Film Noir because…这是 Film Noir，因为……
This is Film Noir because the drama comes from lighting — real cast shadows, light slats, and smoke carving a black-and-white scene — and the palette is strictly achromatic, not two chosen inks.
这是黑色电影，因为戏剧性来自打光 —— 真实的投影、光栅和烟雾把一个黑白场景切割出来 —— 而且配色严格无彩色，不是选定的两种油墨。
It would become Duotone if…如果……就变成 Duotone 了
It would become Duotone if the shadows were flattened into a print-style tonal remap and the palette locked to two chromatic inks like navy and coral — a graphic print treatment instead of a lit scene.
如果把阴影压平成印刷式的影调重映射，配色锁定为两种彩色油墨（比如藏青加珊瑚红）—— 从「被照亮的场景」变成「图形印刷处理」—— 就变成双色调了。