Dark Spot 

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An undesirable concentration of an ink pigment in one particular spot, commonly caused by a pit or depression in the surface of the substrate.

Data Compression

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The process of removing redundant bits of information from a digital file (especially a graphics, audio, or video file) as a means of reducing file size and/or expediting processing and …

De-Inking 

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In papermaking, the removal—either by mechanical or chemical means—of removing ink from wastepapers during recycling.

De-Skewing

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In image manipulation, an adjustment made to an image to compensate for physical or dimensional distortions caused by errors in scanning.

Deckle 

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A type of paper with an irregular, untrimmed edge which decreases in thickness towards the edge of the paper. Deckle edge paper is commonly used for high-quality books, booklets, announcements, …

Delta E 

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The term Delta E or ∆E is used to describe color differences in the CIELAB color space. The term stems from the greek letter delta which is used in science to denote …

Densitometer 

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A densitometer is an instrument having a light-sensitive photoelectric eye for measuring the density of colored ink to measure and control the optical density of color inks on the substrate. …

Density 

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In imaging and color, the perceived darkness of a substance, material, or image caused by the absorption or reflection of light impinging on the material. Differences in density as related to …