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From Raw to Color

At long last, we come to the nitty-gritty of the conversion from Camera Raw to gamma-corrected RGB. In Chapter 5, Hands-On Camera Raw, we’ll look at the various ways it makes sense to use the controls Camera Raw offers. Here, though, we’ll look at how they actually apply to the raw conversion.

Demosaicing and Colorimetric Interpretation

The first stage of the process, demosaicing, introduces the color information, turning the grayscale image into an RGB one. This stage is also where the initial colorimetric interpretation occurs—the grayscale is converted to a “native camera space” image, with linear gamma and primaries (usually, but not always, R, G, and B—some cameras add a fourth color filter) defined by the built-in profiles that define each supported camera’s color space. (See the sidebar “Camera Raw and Color” for more details on how Camera Raw handles the tricky task of defining camera color.) The demosaicing and colorimetric interpretation happen automatically to produce the default rendering you see in Bridge and the larger one you see when you open the image in Camera Raw.


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