Apple MB673Z/A User Manual - Page 648

compare image In Aperture, an image set to remain onscreen while other images are viewed against it. The compare image is indicated by a green border. See also image. 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 images 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, density, flat. Contrast parameter An Enhance adjustment parameter in Aperture used to adjust the contrast in an image. See also adjustment, contrast, Exposure adjustment. control bar The control bar contains buttons and controls you can use to rotate, 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. 648 Glossary