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So, if I'm understanding this correctly, the clear pixel (the white in RGBW) records raw light luminosity (no color) and because there is no color filter on it at all, it gets much more light at the photo diode than the color-filtered pixels. This allows Sony to record the luminosity of the image with a much higher signal-to-noise ratio than before. It does not improve color noise, but does improve luminosity noise and they apparently think this improves overall IQ.

Link | Posted on Aug 21, 2012 at 19:29 UTC as 2nd comment | 1 reply
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