Apple Aperture 2 - Manual (Page 652)

652 Glossary
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 .
Enhance adjustment An adjustment in Aperture that adjusts contrast, definition,
saturation, and vibrancy, as well as black, gray, and white tints in an image. See also
adjustment , contrast , Contrast parameter , definition , Definition parameter , saturation ,
Saturation parameter , tint , Tint adjustment , Vibrancy parameter .
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
IPTC , metadata .
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
adjustment ,
aperture , contrast , digital image sensor , Exposure adjustment , shutter .
Exposure adjustment An adjustment in Aperture that adjusts exposure, recovery,
black point, and brightness. See also
adjustment , Black Point parameter , Brightness
parameter , exposure , Recovery parameter .
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 .