D
desktop publishing
The process of creating fully composed pages using a standard platform computer, off-the-shelf software and an output device. These components form a system that is driven by device-independent page description language, such as PostScript. The pages, comprised of text and graphics, are output to a printer or imagesetter.
detail enhancement
A scanning term, the technique of exaggerating picture image edges with the unsharp masking or peaking scanner control, so that the observer can see all the detail of the original in the reproduction.
device independence
The characteristic of a computer system or program that allows different output device to image the same file more or less identically. PostScript was the first major device-independent page description language
device-independent colour
A concept referring to colour images that appear the same on different output devices, including monitors and various printers.
DFS
Abbreviation for Distributed File System
DHCP
Abbreviation for Dynamic Host Configuration Protocol
diazo
A non-silver coating for photographic contact printing, in offset platemaking and coating used wipe-on.
Didot
The point system used in most European countries. One didot point is equal to 1.07 American point.
Didot, Firmin
Celebrated Parisian designer (1764-1836), son of the printer Francois Ambroise Didot. He was the director of the Imprimerie Impériale type foundry and has a beautiful typeface named after him.
diffraction
The interaction of weak wavefronts with primary wavefronts of light to produce patterns of light where they reinforce each other and dark where they cancel each other out.
diffuse highlight
The whitest neutral area of an original or reproduction that contains detail and will be reproduced with the smallest printable dot. Diffuse highlight should not to be confused with specular highlight, which is a direct reflection of a light source in a shiny surface, has no detail, and is printed with no dot.
diffusion
The scattering of light by reflection or transmisison
diffusion transfer
A photographic system consisting of: (1) a photographic emulsion on which a negative is made, and (2) a receiver sheet on which a positive of the image is transferred during processing. Polaroid film is based on the diffusion transfer system.
Digital Asset Management
A computer software and/or hardware system which archives, tracks and manages digital page elements (including but not limited to text, graphic and photo images, pages, templates, line art, logos, finished layouts, PDFs, and more recently, video and audio clips). DAM systems allow users to quickly recall these elements for re-use in new jobs, saving the production time of recreating them. Though some would argue that a plain paper job bag is a form of DAM, in the last 10 years, DAM has been referenced as a digital software and/or hardware solution.
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