442 Glossary
flat The lack of density in an image when the contrast is too low. See also contrast, density.
focal length The distance from the rear nodal point of the lens to the point where the
light rays passing through the lens are focused onto the image plane—the digital
image sensor. Focal lengths are measured in millimeters (mm).
folder A type of container in the Aperture Library used to organize projects and
albums within projects. See also album, Library, project.
foreground The area of the image between the subject and the camera. See also
background, depth of field.
format a. File format: A specific method of encoding information. Most well-known file
formats, such as TIFF and PNG, have published specifications. b. Disk formatting: The
preparation of a hard disk or other storage medium for use with a file system. For
example, disk drives used with Mac OS X use the Mac OS Extended format. See also
JPEG, PNG, PSD, TIFF, vault.
frame The border of an image. Frame can also be used as a verb to describe the
process of constructing a composition within a specific image area. See also crop.
frontlighting A light source, emanating from the direction of the camera, that faces
toward the subject. See also backlighting, sidelighting.
Full Screen mode A mode in Aperture with minimal user interface, used to view
full-screen images with the least amount of light and color interference. See also
filmstrip, HUD.
gamma A curve that describes how the middle tones of an image appear. Gamma is a
nonlinear function often confused with brightness or contrast. Changing the value of
the gamma affects middle tones while leaving the whites and blacks of the image
unaltered. Gamma adjustment is often used to compensate for differences between
Macintosh and Windows video cards and displays. The Mac Standard gamma is 1.8; the
PC Standard is 2.2.
gamut The range of colors an individual color device is capable of reproducing. Each
device capable of reproducing color has a unique gamut determined by age, frequency
of use, and other elements such as inks and paper. See also device characterization,
device dependent, gamut mapping, ICC profile.
gamut mapping The process of identifying colors outside a device’s gamut and then
calculating the nearest color within its gamut. Gamut mapping is used when receiving
color information from another color space. See also color space, gamut
.
highlights The brightest areas of the subject or scene. See also contrast, density, shadows.
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