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RASTER IMAGE PROCESSOR - in digital imaging, a combination of computer software and hardware that controls the printing process by calculating the bit maps of images and instructing the printing device to create images.
REAM - Five hundred sheets of paper.
REGISTER - The fitting of two or more printing images in exact alignment with each other.
REGISTER MARKS - Crosses or other targets applied to original copy prior to photography. Used for positioning of films or for register of two or more colors in process printing.
RESOLUTION - The quantification of printout quality using the number of spots per inch.
RGB (RED GREEN BLUE) - The primary additive colors used in display devices and scanners.
RUN-AROUND - In composition, the term describing type set to fit around a picture or other element of the design.