D
dupe
A second generation original, a reproduction of an original transparency made on transparency film for the purpose for changing its size or to make additional copies to supply multiple printing sites.
duplex
- In data communication, a mode that permits a user to transmit and receive data simultaneously. Half duplex permits that user to either transmit or receive.
- A printer that prints both sides of a sheet simultaneously
duplex paper
Paper with different colours or finish on each side
DVD
Abbreviation for Digital Versatile Disk: a storage format that uses optical disks similar to CD-ROMs to store information. A DVD disc is the same size as a CD-ROM, although it stores much greater quantities of information, up to 17 GB.
DXF
Abbreviation for Document eXchange Format, a file format that is used for CAD images. DXF was created for the AutoCAD program by Autodesk, Inc.
dye sublimation
A printing technique used in some printers, whereby ink on sheets of ribbon material is heated and fused with the surface of a sheet of special dye-sublimation paper. Dye sublimation printers produce high quality but their output is rather costly. This explains why this technology has virtually disappeared on the market.
dynamic range
A measure of the total range of tones in an image, from lightest to darkest. The greater the dynamic range of an image, the more visible detail it has in highlights and shadows. A scan with a wide dynamic range will reveal a wide range of tones and show visible detail in even the darkest shadows. To scan transparant originals, a scanner needs a far wider dynamic range than for scanning opaque originals.
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