detail rendering/rendition (In French rendu des détails) quality of information transmission with respect to detail in all tone value ranges, including noise and resolution limits; detail and color rendering are influenced jointly through changes in the printing characteristic.
destination profile (In French profil cible) see Tables I-2 “ICC profiles classification” on page 56
desaturation (In French désaturation) removal of chromaticness in intuitive image processing tools and in monitors.
densitometer (In French densitomètre) measuring device with which the optical density or color density (light obscuration) is determined as a indirect measure for the layer thickness of the printing ink. The thickness measurement requires a polarization filter which compensates for the differences between wet and dry ink layers. Compared to obsolete devices with the optical filters R, G, B and Vis (for measuring of black ink), densitometers today work with a spectral scanning head and…
Delta E, color difference/deviation (In French différence entre deux couleurs) delta E, dE, ΔE difference between two chromaticity coordinates in a perceptually equidistant color space. It is calculated with the so-called Euclidean difference formulae, the root of the sum of the color coordinate squares – see back inside cover pages: CIELAB. To prevent confusion with color differences that were calculated using a color difference formula from a different color system, a complete Delta E specification…
definition (In French définition) measure [pixel × pixel] for the number of picture elements (“pixels”) in the horizontal and vertical (line number) on monitors (must be supported by the video card of the computer or of the hardware-calibratable monitor), CCD cameras and scanners; the highest monitor resolution currently possible: QWUXGA/WQUXGA 3840 × 2400; 30-inch monitor by NEC: 2560 × 1600; HDTV: 1920 × 1080 and 1280 × 720 pixels.
Default-CMM CMM standard see CMM
DDCP, direct digital color proof (In French système d’épreuves couleur numériques direct) direct, i.e. filmless digital color test print process, in short digital proof, usually with a claim to contract color-proof. Inkjet printing has gained acceptance as the test print method.
DCS, Desktop Color Separation see Tables D-1 “Data file formats” on page 42
daylight, diurnal light (In French lumière du jour) spectral radiation distributions defined by the CIE which are oriented towards different sun position and solar radiation angle phases (daylight phases) and which can be copied as “artificial daylight” with the help of technical light sources: D50 = 5003 Kelvin, D55 = 5503 K, D65 = 6504 K, D75 = 7504 K. The definition includes the respective natural UV shares of the sunlight.
D65, artificial daylight 6500 K (In French lumière artificielle 6500 K) artificial daylight with a highly similar color temperature of 6502 Kelvin; standard CIE illuminant which is used in the paper, textiles, plastics and automobile industries, frequently in conjunction with the 10° standard observer field of view and which cannot be transformed in this form into D50/2°.
Cromalin Brand of DuPont de Nemours (USA); in the era of analog proofs, became their synonym. CRT display, cathode ray tube display moniteur CRT, écran à tube cathodique out-of-date cathode ray tube design for monitors and television sets; advantages: surface homogeneity, viewing angle-independent color rendering, high resolution quality, slow ageing; disadvantages: space requirements weight, electricity consumption, susceptibility to repairs. CT ton continu internationally used abbreviation for half-tone originals (color transparencies, photo prints, digital photos), as…
corporate/CI color (In French couleur spéciale) color shade that is communicated as part of the corporate identity in logos, labels and color surfaces and which is technically implemented either as a spot color, a special color or CMYK separation; can be protected as a color trade mark or patent; examples of color ordering systems: ADAC: “Rape yellow” RAL 1021; Aral: blue background HKS 47; Deutsche Telekom: “Telemagenta” Pantone Rhodamine Red U; Red Bull drink can:…
contract color-proofed (In French épreuve couleur contractuelle) quality of a digital proof or press proof whose printed image agrees with the subsequent production run image in color rendering, whereby compliance with the relevant tolerances (color and chromaticness distances in the evaluation of a control element, e.g. media wedge) is to be documented so that it is forgery-proof.
continuous tone, CT (In French ton continu) designation for continuous tone value transitions, like those in photographic originals; the English word “halftone”, on the other hand, is used for halftone images.
consistency, match (In French concordance) result of a color comparison without recognizable or measurable deviation.
conglomerates (In French conglomérats) intended agglomeration of pigment particles in wide gamut inks, in order to achieve higher color densities through maximum pigment concentration and color strength.
cones, uvulas (In French cônes (de la rétine)) retinal receptors responsible for daytime vision and thus for color vision
composite file (In French fichier composite) file form in which the color separation has already taken place, but the color separation files are still together in one single file for illustration and handling reasons, that is, the division into individual color separation files has not yet taken place, e.g. Composite PDF.
composing (In French assemblage) 1) in digital image processing and graphics creation, the creation of motifs from different images in grouped image files or in a new image file, with artificial light and shadow effects being used. 2) Text-image integration. In both scenarios, the uniform color rendering quality of the individual elements is a challenge.
