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HALF-TONE [8 records]

Record 1 2014-12-05

English

Subject field(s)
  • Printing Processes - Various
DEF

Any photomechanical printing surface or the impression therefrom in which detail and tone values are represented by a series of evenly spaced dots of varying size and shape, varying in direct proportion to the intensity of the tones they represent.

OBS

half-tone : term and definition standardized by NATO.

Key term(s)
  • halftone

French

Domaine(s)
  • Procédés d'impression divers
DEF

Support d'impression ou impression dans lequel les divers tons sont différenciés au moyen de points de densité constante mais de taille ou de forme variable.

OBS

La taille ou la forme de ces ensembles de points varie suivant l'intensité du ton à représenter.

OBS

demi-teinte : terme et définition normalisés par l'OTAN.

Spanish

Campo(s) temático(s)
  • Distintos procesos de impresión
DEF

Soporte de impresión o impresión en la que los detalles y valores de tonalidad son representados por una serie de puntos espaciados regularmente que varían de tamaño y forma, en proporción directa a la intensidad de los tonos que ellos representan.

Save record 1

Record 2 2010-09-27

English

Subject field(s)
  • Scientific Research Methods
  • Optics
CONT

Temporal Paul wavelet analysis for instantaneous phase extraction using shadow moiré technique is proposed. Unlike the Morlet wavelet, the Paul wavelet has less restriction on the adjustment of wavelet parameters and can provide an optimal time and frequency resolution for a particular application by selecting the proper parameters. The Paul wavelet is a complex wavelet and is suitable for processing the temporal intensity data obtained from the shadow moiré technique for the phase retrieval. The proposed method can extract the phase information related to the state of the dynamic object at every instant in temporal domain. The phase information is associated to the displacement, three-dimensional (3D) surface-profile and the instantaneous state of the dynamic object. In addition, the instantaneous frequency of vibrating object can be obtained using the scale of the wavelet ridge by direct integration without temporal and spatial phase unwrapping. Thus the phase unwrapping error can be avoided. An experiment is conducted on the central loaded beam to demonstrate the validity of the proposed technique.

OBS

The term “moiré” is... a French word referring to “an irregular wavy finish usually produced on a fabric by pressing between engraved rollers”(Webster's 1981). In optics it refers to a beat pattern produced between two gratings of approximately equal spacing. It can be seen in everyday things such as the overlapping of two window screens, the rescreening of a half-tone picture, or with a striped shirt seen on television. The use of moiré for reduced sensitivity testing was introduced by Lord Rayleigh in 1874. Lord Rayleigh looked at the moiré between two identical gratings to determine their quality even though each individual grating could not be resolved under a microscope.... Since Lord Rayleigh first noticed the phenomena of moiré fringes, moiré techniques have been used for a number of testing applications. Righi(1887) first noticed that the relative displacement of two gratings could be determined by observing the movement of the moiré fringes. The next significant advance in the use of moiré was presented by Weller and Shepherd(1948). They used moiré to measure the deformation of an object under applied stress by looking at the differences in a grating pattern before and after the applied stress. They were the first to use shadow moiré, where a grating is placed in front of a nonflat surface to determine the shape of the object behind it by using the shape of the moiré fringes.

French

Domaine(s)
  • Méthodes de recherche scientifique
  • Optique
CONT

Le moiré d’ombre. Cette technique […] consiste à créer un moiré entre une grille de référence placée juste devant l’objet, et l’ombre de cette même grille projetée sur la surface étudiée. Les déformations de cette surface modifient le pas du réseau «ombre» créant ainsi le moiré. Une mesure du pas de ce moiré permet, à l’aide des équations précédentes, de remont3er aux déformations locales et de dresser la carte des hauteurs.

CONT

Le moiré d’ombre. Il s’agit d’un dérivé (conceptuellement, pas historiquement) de la mesure de forme par projection de frange.

Spanish

Save record 2

Record 3 2006-01-12

English

Subject field(s)
  • Flexography (Printing)
OBS

half-tone flexo : term extracted from the Vocabulaire de la flexographie of France Brodeur and reproduced with the authorization of the Institut des communications graphiques du Québec.

French

Domaine(s)
  • Flexographie (Imprimerie)
DEF

Impression de demi-teintes en flexographie par opposition au trait et à l'aplat.

OBS

impression tramée en flexo : terme et définition tirés du Vocabulaire de la flexographie de France Brodeur. Reproduction autorisée par l'Institut des communications graphiques du Québec.

Spanish

Save record 3

Record 4 2002-02-26

English

Subject field(s)
  • Photography
DEF

A series of regular spaced opaque lines on glass, crossing at right angles, producing transparent apertures between intersections. Used in a process camera to break up a solid or continuous tone image into a pattern of small dots.

OBS

half-tone screen : term and definition standardized by NATO.

French

Domaine(s)
  • Photographie
DEF

Ensemble de lignes opaques (sur une surface transparente), se coupant à angle droit de façon à réaliser des trous transparents entre les intersections. Ce canevas est utilisé au cours d'un traitement photographique pour réaliser, à partir d'une image en tonalités continues, une représentation en demi-teinte, c'est-à-dire codée par des séries de points de taille et de forme adaptée à la tonalité à représenter.

OBS

trame de demi-teinte : terme et définition normalisés par l'OTAN.

Spanish

Campo(s) temático(s)
  • Fotografía
DEF

Conjunto de líneas opacas regularmente espaciadas sobre un cristal, que se cortan perpendicularmente y que tienen aberturas transparentes entre las intersecciones. Esta cámara se usa en el proceso fotográfico para realizar una representación a medio tono a partir de una imagen de tonalidades continuas, es decir, codificada por una serie de puntos de tamaño y forma adaptadas a la tonalidad que se quiere representar.

Save record 4

Record 5 2002-01-11

English

Subject field(s)
  • Printing Machines and Equipment
  • Engineering Tests and Reliability
DEF

A measure of the degree of light scattering within a fibrous web.

OBS

Scattering causes the white area of paper between the half-tone dots in printing to appear grey rather than white due to the absorption and loss of the scattered light. Scattering coefficient and light Absorption coefficient are fundamental properties of paper which, along with basis weight are related to opacity and brightness.

French

Domaine(s)
  • Équipement (Imprimerie et arts graphiques)
  • Fiabilité, contrôle et essais (Ingénierie)
DEF

Mesure de la dispersion de la lumière dans un matériau fibreux.

Spanish

Save record 5

Record 6 1999-09-10

English

Subject field(s)
  • Photography
DEF

A contact screen composed of magenta dyed dots of variable density, used for making half-tone negatives in the camera.

French

Domaine(s)
  • Photographie
DEF

Trame de contact dont la dégradation des points est d'une coloration pourpre.

Spanish

Save record 6

Record 7 1986-07-08

English

Subject field(s)
  • Typography
OBS

Printing matter, obtained mechanically, electrolytically or by etching on metal or plastic, for use in typographic printing; EX :half-tone block.

French

Domaine(s)
  • Typographie (Caractères)
OBS

Dans le langage courant: bloc dont la partie supérieure constitue l'image imprimante mise en relief par rapport aux blancs.

Spanish

Save record 7

Record 8 1977-06-06

English

Subject field(s)
  • Mathematical Geography
  • Geological Research and Exploration
OBS

This process converts the original continuous-tone image into one composed of minute random dots which can be reproduced by lithography without the use of a half-tone screen. This term is derived from Photographic Image Conversion by Tonal Masking Procedures.

French

Domaine(s)
  • Géographie mathématique
  • Recherches et prospections géologiques
OBS

Procédé photographique de reproduction d'une image en demi-teintes, le plus souvent une photographie aérienne, suppléant l'emploi d'une trame en schématisant les contours caractéristiques des détails sous forme de lignes de rupture de densité.

Spanish

Save record 8

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