Halftone

Halftone

Halftoning

Le Halftoning (demi-ton), ou génération d'images en demi-tons est une technique utilisée par les imprimantes, pour permettre de rendre des niveaux de gris à partir d'une impression binaire. Les imprimantes ne peuvent imprimer que des points d'encre, et les arrangent de telle sorte que l'oeil humain ne discerne plus ces points, mais intègre ces valeurs pour donner une illusion de niveau de gris.

Principe

Différentes techniques d'Halftoning

  • Tramage à point centré
  • Tramage à point dispersé
  • Tramage par diffusion d'erreur
    • Exemple : diffusion d'erreur Floyd-Steinberg

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  • Halftone —   [dt. Halbton], Halbtonbild …   Universal-Lexikon

  • halftone — [haf′tōn΄] n. 1. Art a tone or shading between light and dark 2. Music SEMITONE 3. Photoengraving a) a technique of representing shadings by dots produced by photographing the object from behind a fine screen b) a photoengraving so made …   English World dictionary

  • Halftone — For the music interval, see semitone. Left: Halftone dots. Right: How the human eye would see this sort of arrangement from a sufficient distance. Halftone is the reprographic technique that simulates continuous tone imagery through the use of… …   Wikipedia

  • halftone — /haf tohn , hahf /, n. 1. Also called middle tone. (in painting, drawing, graphics, photography, etc.) a value intermediate between light and dark. 2. Print. a. a process in which gradation of tone in an image is conveyed by first photographing… …   Universalium

  • halftone — UK [ˌhɑːfˈtəʊn] / US [ˈhæfˌtoʊn] noun Word forms halftone : singular halftone plural halftones a) [uncountable] a way of printing black and white photographs that uses spots of different sizes b) [countable] a photograph printed using the… …   English dictionary

  • halftone — noun Date: 1651 1. half step 2 2. a. any of the shades of gray between the darkest and the lightest parts of a photographic image b. (1) a photoengraving made from an image photographed through a screen and then etched so that the details of the… …   New Collegiate Dictionary

  • halftone — half|tone [ hæf,toun ] noun uncount a way of printing black and white photographs that uses spots of different sizes a. count a photograph printed using the halftone method …   Usage of the words and phrases in modern English

  • halftone — /ˈhaftoʊn/ (say hahftohn) noun 1. Painting, Photography, etc. a value intermediate between high light and deep shade. 2. Photoengraving a. a process in which gradation of tone is obtained by a system of minute dots produced by a screen placed in… …  

  • halftone — pustoninis spausdinimas statusas T sritis informatika apibrėžtis Įvairaus ↑pilkumo tonų išgavimas naudojant tik juodus ir baltus taškus. Beveik visuose spausdintuvuose vaizdas sudaromas vien iš juodų ir baltų taškų. Įvairūs pilkumo tonai gaunami… …   Enciklopedinis kompiuterijos žodynas

  • halftone — noun 1. a print obtained from photoengraving • Hypernyms: ↑engraving 2. an engraving used to reproduce an illustration • Syn: ↑halftone engraving, ↑photoengraving • Hypernyms: ↑engraving …   Useful english dictionary

  • Halftone characteristic — In telecommunication, the term halftone characteristic has the following meanings: # In facsimile systems, the relationship between the density of the recorded copy and the density of the object, i.e. , the original. # In facsimile systems, the… …   Wikipedia

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