Apple Aperture 3.5 - Manual (Page 506)

Glossary 506
complementary metal oxide semiconductor (CMOS) A type of digital image sensor that
is capable of recording the entire image provided by the light-sensitive elements in parallel
(essentially all at once), resulting in a higher rate of data transfer to the storage device. Tiny
colored microlenses are fitted on each light-sensitive element in a CMOS sensor to increase its
ability to interpret light. See also charge-coupled device (CCD), digital image sensor.
compositing A process in which two or more digital images are combined into one. See
also effects.
composition The arrangement of visual elements in a scene.
compression The process by which digital image files are reduced in size. Lossy compression
is the process of reducing digital image file sizes through the removal of redundant or less
important image data. Lossless compression reduces file sizes by mathematically consolidating
redundant image data without discarding it. See also decompression, LZW compression.
cones A type of receptor in the eye capable of perceiving color. There are three types of cone
cells, each sensitive to a particular frequency range in the visible spectrum. Cone cells are
capable of seeing either red, green, or blue colors. See also rods.
contact sheet Based on a print preset in Aperture, a printed selection of thumbnail-sized photos
with or without associated metadata. Contact sheets in Aperture are similar in appearance to
contact prints made by exposing negatives or transparencies against photographic paper.
contrast The difference between the brightness and color values in an image that allows the
viewer to distinguish between objects in an image. High-contrast images have a large range
of values, from the darkest shadow to the lightest highlight. Low-contrast images have a more
narrow range of values, resulting in a “flatter” look. See also Contrast parameter, Curves adjustment,
density, flat.
Contrast parameter An Enhance adjustment parameter in Aperture used to adjust the contrast
in an image. See also adjustment, contrast, Exposure adjustment.
Contrast Quick Brush A type of Quick Brush adjustment that applies additional contrast to
the area of the image the adjustment is brushed on. See also adjustment, Brush HUD, contrast,
Quick Brushes.
control bar The control bar contains buttons and controls you can use to rate and navigate
through images, as well as apply keywords to them. See also keywords, rating.
copyright The legal right to exclusive publication, production, sale, or distribution of a literary,
musical, or artistic work. Typically, these rights are in effect for a specific period of time.
crop The process of printing or distributing only part of the original image. The general purpose
of cropping an image is to create a more effective composition. Another reason for cropping an
image is to make it fit a particular aspect ratio, such as 4 x 6. See also adjustment, aspect ratio,
composition, Crop adjustment, effects.
Crop adjustment An adjustment in Aperture that trims the image for the purpose of changing
the composition or modifying the aspect ratio. The Crop adjustment is used in conjunction with
the Crop tool. See also adjustment, aspect ratio, composition, crop.
Curves adjustment An adjustment in Aperture that selectively remaps the tonal range of the
image by applying a curve from input to output. Manipulating the curve modifies the tonal
values in the image. See also adjustment, contrast.
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