• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 2. How Camera Raw Works > Demosaicing and Colorimetric Interpretation

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 the File Browser and the larger one you see when you open the image in Camera Raw.

Operationally, the first step is the colorimetric interpretation. The demosaicing is then performed in linear-gamma camera space. A little noise reduction, and any chromatic aberration corrections, are also done in the native camera space. (Chromatic aberration corrections could cause unwanted color shifts if they were done later in a non-native space.)


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint