446 Glossary
photo printer A type of printer capable of producing photo-quality images. See also
gamut, dye sublimation, inkjet printer, offset press, print, RA-4.
pick The image that represents the stack. The pick is usually the best image in the
stack. See also alternate, stack.
pixel The smallest discernible visual element of a digital image. See also megapixel.
polarizing filter A filter placed on the front of the camera lens that selectively
transmits light traveling on one plane while absorbing light traveling on other planes.
Polarizing filters are capable of reducing unwanted reflections on windows and shiny
surfaces. Polarizing filters are also used to darken the sky. See also filters.
positive Developed film where the tonal relationship of the subject or scene is the
same on film as viewed by the eye; also known as a slide. See also dust and scratch
removal, emulsion, negative.
PNG Short for Portable Network Graphics. PNG is a bitmapped graphics file that has
been approved by the World Wide Web Consortium to replace patented GIF files. PNG
files are patent and royalty free. See also format.
presets A saved group of settings, such as export, naming, print, and web export
settings. Presets determine properties such as file format, file compression, filename
construction, paper size, and ColorSync profile. Presets are usually defined for particular
workflows and can be tailored to client specifications. See also ColorSync.
prime lens A lens with a fixed focal length that cannot be changed.
print An image printed on paper; also known as a photograph. See also dye
sublimation, inkjet printer, RA-4.
profile A compilation of data on a specific device’s color information, including its
gamut, color space, and modes of operation. A profile represents a device’s color-
reproduction capabilities and is essential to effective color management. See also
device characterization, gamut.
program exposure An exposure mode on many automatic cameras where the camera
automatically sets the aperture and shutter values for a correct exposure. See also exposure.
project In Aperture, the top-level container that holds all the master files, versions, and
metadata associated with your shoot. See also
album, folder, Library, master file, version.
PSD The file extension for Photoshop Document. PSD files are proprietary graphics
files for Adobe Systems Incorporated. See also format.
pupil The part of the eye that contracts and expands depending on the amount of
light; also known as the iris.
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