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Originally Posted by RossJarvis  In my mind I considered a digital sensor as this two dimensional field where the sensors were positioned via the x y axies, however as the sensors can record tone too, how do we represent this in graphical terms. (We could ignore a value for colour as maybe this could be attributed to different positions related to different colours). In my mind a value for tone would have to come into the z axis, therefore being out into the third dimension. |
Each photo diode in the sensor contains an analog value of the strength of the light, as it passes through the Bayer filter, and so can have more values that simply 1 or 0. What makes it digital is the software algorithms that decide what color a particular point needs to be (one of the reasons that color digital images exhibit a continuous tone appearance). The Z axis really doesn't come into play as far as I'm aware of.