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Mastering Exposure and the Zone System for Digital Photographers by Lee Varis

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Calibrating for Color

Calibrating for exposure is only half of the calibration process. These days, whether we are creating images for B+W or color, we are shooting in color so it makes sense to be able to capture the most accurate neutral color as possible. Most current digital capture systems create color during post capture processing. RAW processing software is designed to interpolate color information from varying brightness of pixel sites that have a colored filter of red, green, or blue. In essence, there is no color in the RAW data—color is inferred by measuring the brightness of pixel clusters. The colored filters covering the tiny pixel sites are not perfect and, manufacturing processes being what they are, there is some variation ...

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