Operation Manual

Loupe A tool in Aperture used to magnify the area of the image you place it over. See
also image.
luminance A value describing the brightness of all color channels combined in a pixel.
LZW compression A lossless data-compression algorithm developed by Abraham Lempel,
Jakob Ziv, and Terry Welch in 1984. LZW compression algorithms are typically used with
JPEG and TIFF graphics files to reduce the file size for archiving and transmission at a ratio
of 2.8:1. See also compression, JPEG, TIFF.
macro lens A type of lens used for extreme close-up photography. See also camera, lens,
prime lens, telephoto lens, wide-angle lens, zoom lens.
main Viewer For systems with multiple displays, the main Viewer is used for displaying
the Aperture application. See also display, secondary Viewer.
managed images Images whose masters are stored in the Aperture library. The locations
of the individual masters are managed by the Aperture database. Managed image files
are always online. See also library, master, offline, online, referenced images.
master The source media file that was copied from either your computer’s file system or
your camera’s memory card. In Aperture, the master is never modified. Whenever a change
is made to an image, a video clip, or an audio clip, that change is applied to the version.
See also memory card, project, version.
megapixel One million pixels. For example, 1,500,000 pixels equals 1.5 megapixels. See
also digital image sensor, pixel.
memory card The device in the camera where digital images are stored. See also camera,
capture.
merging libraries The process of importing an Aperture library file and merging its
contents into the library that is currently open in Aperture. See also library.
metadata Data about data; metadata describes how data was collected and formatted.
Databases use metadata to track specific forms of data. Aperture supports both EXIF and
IPTC metadata. See also EXIF, IPTC.
meter The process of using a light meter to calculate the appropriate exposure. See also
light meter.
midtones The color values in an image between the highlights and shadows. See also
contrast, highlights, Highlights & Shadows adjustment, Levels adjustment, shadows.
mirroring The process of showing the same image on two or more displays. See also
extended desktop mode.
893Glossary