Operation Manual

dot gain A printing term used to describe the enlargement of halftone dots as ink is
absorbed into paper. Dot gain can affect the quality of an image’s appearance by reducing
the amount of white reflected off the paper.
dots per inch (dpi) A printer resolution measurement that refers to the maximum number
of dots within a square inch. See also print, resolution.
drift Changes in the way a device reproduces color over time. For example, the age of
inks and the type of paper can cause a printer’s color output to drift. See also device
characterization, gamut.
drop shadow An effect that creates an artificial shadow behind an image. Typically used
on websites and in photo albums to create the illusion of three dimensions.
Duplicate Version command A command in the Photos menu that duplicates the selected
image version with all applied metadata and adjustments. See also adjustment, image,
metadata, version.
dust and scratch removal The process of digitally removing the blemishes caused by
dust and scratches on film scans. See also Retouch adjustment.
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, photo printer, print,
RA-4.
Edge Sharpen adjustment An adjustment in Aperture that sharpens the image based
on luminance using multiple sharpening passes. See also adjustment, image, Sharpen
adjustment.
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.
885Glossary