From the course: Exploring Photography: Shooting in Raw Mode
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Understanding Foveon sensors
From the course: Exploring Photography: Shooting in Raw Mode
Understanding Foveon sensors
- The explanation that I've been giving for how a digital image sensor works is true for most of the sensors out there. However, every once in a while a new technology comes along that works differently than the demosaicing interpolating sensors that we've been looking at. The most significant of these is the Foveon sensor, which today is used in certain Sigma cameras. Now, Foveon's claim to fame is that there's no demosaicing in their sensors. Each individual cell on the surface of the sensor captures full color, all three channels. The Foveon sensor does this by exploiting the fact that silicon absorbs different wavelengths of light at different depths, so red light can penetrate further into a piece of silicon than can blue light. The Foveon chip takes advantage of this by stacking photo sights on top of each other within the silicon, so in a given location, the red channel is measured at one depth, the green at another, and the blue at the top. This means that every pixel on the…
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