NSL Photography's Glossary™ of Photographic Terms - #

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18% Gray
Middle Gray, or a standard average gray tone of 18 percent reflectance. The exposure meters of digital cameras are typically calibrated to 18% Gray.

3D Color Matrix Meter
Originally a Nikon technology which first appeared on its top film camera at the time, the F5. Since then the 3D Color Matrix Meter has been updated and improved significantly. The Nikon D3X DSLR camera now uses a 1,005-pixel RGB sensor for its metering. The 3D Color Matrix Meter evaluates each scene's brightness and contrast and using a special Red Green Blue (RGB) sensor, evaluates the scene's colors. Its powerful micro-computer uses a special Nikon exposure/color database to set the camera's exposure.

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