According to the Colorblind Web Page Filter, above is what Google.com looks like for users with protanopia (red/ green color blindness).

参照色盲网页过滤器，其看起来像是Google.com为红色盲（红绿色盲）服务的。

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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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The first permanent colour photograph was taken by Thomas Sutton who was working with Clerk Maxwell and is a composite of three black and white pictures, each one taken through a red, green or blue filter.

BBC: Pioneering colour photography

They photographed a Scottish tartan ribbon three times, once with a red filter, once with green, and once with blue.

FORBES: GPotD: Maxwell's Tartan Ribbon

Philips' solution is to combine two blue and one red element, but use a green phosphor filter to convert one of the blue LEDs to green.

ENGADGET