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众所周知,光圈、曝光时间和ISO是控制相机照片亮度的三种方式。在移动设备中,光圈是固定的,因此控制相机照片亮度的唯一方法是曝光时间和ISO,但是,同时修改曝光时间和ISO或直接修改曝光补偿有什么区别。