The image below is a single 20-second exposure taken with a red-green-blue filter.

下图是用红-绿-蓝滤光片拍摄的单一20秒曝光照片。

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Most commercial digital cameras use color filter arrays to sample the red, green, and blue colors according to a specific pattern.

大多数的数码相机都是根据特定的模板而使用颜色滤波阵列来对红、绿、蓝的颜色进行采样。

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Most commercial digital cameras use a single CCD or CMOS sensor having a color filter array on its surface to get red , green, or blue samples.

大部分消耗型数字相机都采用单片CCD或CMOS图像传感器，并通过一个彩色滤波阵列来实现，因此在每个像素上只能采集红、绿或蓝一种颜色分量。

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In case you don't have your smartphone app handy, the taps are equipped with LED lights to show the water's filter status as well -- blue means clean, yellow means not so much and red means you should probably get a new filter, pronto.

ENGADGET