将背景色调涂淡一点，颜色偏冷一些。
背景色调通常采用简单的纯白色/灰色或纯黑色
Plain, solid white/gray or solid dark backgrounds are common
从物体背面照射的光使物体形成全黑的剪影，而背景色调较亮。
Light coming from behind a subject can form a silhouette resulting in object that is completely black against a lighter colored background.
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