A visual three-dimensional representation of the CIELAB color space.
layout
The arrangement of text, images, and other graphic elements. Aperture has four preset workspace layouts: Standard, Project Management, Ratings and Keywords, and Adjustments and Filters.
lens
A complicated series of elementsusually glassconstructed to refract and focus the reflective light from a scene at a specific point. See also camera, digital image sensor.
library
See master Library.
lift and stamp
A procedure in Aperture that takes (via the Lift tool) a set of adjustments or metadata from one image and applies them (via the Stamp tool) to any number of other images.
light
Visible energy in the electromagnetic spectrum with wavelengths ranging between 400 and 720 nanometers. See also electromagnetic radiation.
light meter
A device capable of measuring the intensity of reflective light. Light meters are used as an aid for selecting the correct exposure settings on the camera. Most cameras have internal light meters. See also center-weighted metering.
light table
Area of the Aperture interface where free-form arrangements of images can be made. Multiple Light Tables can be saved as part of any project.
loupe
A resizable tool in Aperture that can instantly show images at 100 percent magnification and can increase magnification to up to 800 percent. The Loupe can be placed on a single image or run across a series of images to view details.
luminance
A value describing the brightness of a digital image.
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 graphic files to reduce the file size for archiving and transmission at a ratio of 2.8:1. See also compression, JPEG, TIFF.
