440 Glossary
dye sublimation A type of printer that creates images by heating colored ribbon to
a gaseous state, bonding the ink to the paper. See also inkjet printer, print, photo
printer, RA-4.
editing The process of arranging and eliminating images. See also photo edit.
effects A general term used to describe the introduction of unnatural visual elements
to enhance an image. See also compositing, filters.
electromagnetic radiation A type of energy ranging from gamma rays to radio waves
that also includes visible light. See also light.
embedded profile The source profile saved in the digital image file. JPEG, TIFF, PNG, and
PDF file formats support embedded profiles. See also device characterization, profile.
emulsion The tiny layers of gelatin, consisting of light-sensitive elements, found in film.
When the emulsion is exposed to light, a chemical reaction occurs. After the film is
developed, an image appears. See also dust and scratch removal, film.
evaluative metering A type of metering that operates by dividing the frame into
several small segments, taking a reading from each individual segment, and processing
the average of the total segments to recommend the best exposure value for the
overall image. See also center-weighted metering, light meter, spot metering.
EXIF Short for Exchangeable Image File. The standard format for storing information—
such as shutter speed, aperture, white balance, exposure compensation, metering setting,
ISO setting, date, and time—about how an image was shot. See also metadata, IPTC.
export The process of formatting data in such a way that it can be understood by
other applications. In Aperture, images can be exported in their native RAW format, as
well as in JPEG, TIFF, PNG, and PSD formats. The EXIF and IPTC metadata associated
with an image can be exported as well.
exposure The amount of light in an image. Exposure is controlled by limiting the
intensity of light (controlled by the aperture) and the length of time light comes into
contact with the digital image sensor (controlled by the shutter). Exposure affects the
overall brightness of the image as well as its perceived contrast. See also aperture,
contrast, digital image sensor, shutter.
exposure meter See light meter.
extended desktop mode A setting in System Preferences that allows the Mac OS X
desktop to span multiple displays. See also
display, mirroring.
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