ls. Other measurement terms used in the past include the apostilb, blondels, skots, stilbs and the footlambert. Luminous flux is also measured in lumens with one lux equal to one lumen per square metre. There is no direct relationship between lumens and candelas or nits as luminosity is also a function of the composite wavelengths, SO a conversion is only possible if the spectral composition of the light is known. For example, the maximum sensitivity of the human eye is at wavelengths of 555 nanometres, which is green to you and me and presumably designed SO that we can spot edible greenery at a Device-Centric Software distance. The luminosity function falls to zero for wavelengths outside the visible spectrum. As an interesting if only tangentially relevant aside, The Institute of Cognitive and Evolutionary Anthropology, 3 having measured global skulls from the last 100 years collected together in a dusty basement in Oxford, have discovered that people living in high latitudes have bigger eyes and brains. The bigger eyes are SO that they can see better in low light conditions. The bigger brains do not make them more intelligent but are needed to provide the additional visual processing power required. Animals that forage at night similarly have bigger eyes and brains than animals that forage during the day. Anyway, we use nits to describe display brightness and lux to describe the light conditions that dictate whether we can take pictures with our mobile phone. For the Optimus 3D product these pictures are captured through two five-megapixel lenses set apart to allow for stereoscopic processing to produce 3D images/HDTV that can either be displayed on the phone or on an HDTV or uploaded to the You Tube 3D channel rather slowly if you happened to be using a 3G connection. 7.3 Relationship of Display Technologies to Processor Architectures, Software Performance and Power Efficiency Actually before you get this far the phone has to process all this stuff, which it does via Texas Instruments OMAP4 dual-core dual-cha