Nikon D7000 manual Glossary

Glossary 491

buffer The digital camera’s internal memory where an image is stored immediately after it is taken until it can be written to the camera’s non-volatile (semi-permanent) mem- ory card.

burst mode The digital camera’s equivalent of the film camera’s motor drive, used to take multiple shots within a short period of time, each stored in a memory buffer tem- porarily before writing them to the media.

calibration A process used to correct for the differences in the output of a printer or monitor when compared to the original image. Once you’ve calibrated your scanner, monitor, and/or your image editor, the images you see on the screen more closely rep- resent what you’ll get from your printer, even though calibration is never perfect.

Camera Raw A plug-in included with Photoshop and Photoshop Elements that can manipulate the unprocessed images captured by digital cameras, such as the Nikon D7000’s NEF files. The latest versions of this module can also work with JPEG and TIFF images.

camera shake Movement of the camera, aggravated by slower shutter speeds, which produces a blurred image.

Center-weighted meter A light-measuring device that emphasizes the area in the mid- dle of the frame when calculating the correct exposure for an image. See also Matrix metering and Spot meter.

channel In an electronic flash, a channel is a protocol used to communicate between a master flash unit and the remote units slaved to that main flash. The ability to change channels allows several master flash units to operate in the same environment without interfering with each other.

chromatic aberration An image defect, often seen as green or purple fringing around the edges of an object, caused by a lens failing to focus all colors of a light source at the same point. See also fringing.

circle of confusion A term applied to the fuzzy discs produced when a point of light is out of focus. The circle of confusion is not a fixed size. The viewing distance and amount of enlargement of the image determine whether we see a particular spot on the image as a point or as a disc. See also bokeh.

close-up lens A lens add-on that allows you to take pictures at a distance that is less than the closest-focusing distance of the lens alone.

color correction Changing the relative amounts of color in an image to produce a desired effect, typically a more accurate representation of those colors. Color correction can fix faulty color balance in the original image, or compensate for the deficiencies of the inks used to reproduce the image.