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单词 halftone
释义

halftone


half·tone

H0025400 (hăf′tōn′, häf′-)n.1. A tone or value halfway between a highlight and a dark shadow.2. a. A picture in which the gradations of light are obtained by the relative darkness and density of tiny dots produced by photographing the subject through a fine screen.b. A picture made by such a process.3. Music See semitone.

halftone

(ˈhɑːfˌtəʊn) n1. (Printing, Lithography & Bookbinding) a. a process used to reproduce an illustration by photographing it through a fine screen to break it up into dotsb. the etched plate thus obtainedc. the print obtained from such a plate2. (Art Terms) art a tonal value midway between highlight and dark shading3. (Music, other) music US and Canadian another word for semitoneadj (Printing, Lithography & Bookbinding) relating to, used in, or made by halftone

half•tone

(ˈhæfˌtoʊn, ˈhɑf-)

n. 1. (in painting, drawing, graphics, photography, etc.) a value intermediate between light and dark. 2. a. a printing process in which gradation of tone is obtained by a system of minute dots. b. the metal plate used in such a process. c. the print obtained in such a process. 3. semitone. [1645–55] half′tone, adj.

halftone

Any photomechanical printing surface or the impression therefrom in which detail and tone values are represented by a series of evenly spaced dots in varying size and shape, varying in direct proportion to the intensity of the tones they represent. See also halftone screen.
Thesaurus
Noun1.halftone - a print obtained from photoengravinghalftone - a print obtained from photoengravingengraving - a print made from an engraving
2.halftone - an engraving used to reproduce an illustrationhalftone - an engraving used to reproduce an illustrationhalftone engraving, photoengravingengraving - a block or plate or other hard surface that has been engraved
Translations
полутон

halftone


halftone

Art a tonal value midway between highlight and dark shading

halftone

[′haf‚tōn] (graphic arts) An engraving used in printing to reproduce photographs and drawings that contain continuous tones, that is, grays (middle tones or halftones) in addition to black and white; preparation involves photographing the artwork through a screen.

halftone

(graphics)The reproducion of greyscale images using dotsof a single shade but varying size to simulate the differentshades of grey.

Laser printers that cannot print different sized dots,halftones are produced by varying the numbers of dots in agiven area.

This process is also used to produce a black and white versionof a colour original using shades of grey in place of colours.

See also device independent bitmap.

halftone

In printing, the simulation of a continuous-tone image (shaded drawing, photograph) with dots. All printing processes, except for Cycolor, print dots. In photographically generated halftones, a camera shoots the image through a halftone screen, creating smaller dots for lighter areas and larger dots for darker areas. Digitally composed printing prints only one size of dot.

In order to simulate variable-sized halftone dots in computer printers, dithering is used, which creates clusters of dots in a "halftone cell." The more dots printed in the cell, the darker the gray. As the screen frequency gets higher (more cells per inch), there is less room for dots in the cell, reducing the number of shades of gray or color that can be generated.

In low-resolution printers, there is always a compromise between printer resolution (dpi) and screen frequency (lpi), which is the number of rows of halftone cells per inch. For example, in a 300 dpi printer, the 8x8 halftone cell required to create 64 shades of grays results in a very coarse 38 lines per inch of screen frequency (300 dpi divided by 8). However, a high-resolution, 2400 dpi imagesetter can easily handle 256 shades of gray at 150 lpi (2,400 / 16).

PRINTER RESOLUTION & MAXIMUM SCREEN FREQUENCYShades of Gray or --At printer resolutions--Cell Colors 300 dpi 1200 dpi 2400 dpi4x4 16 150 lpi 300 lpi 600 lpi 8x8 64 38 lpi 130 lpi 300 lpi 16x16 256 19 lpi 75 lpi 150 lpi



Analog vs. Digital
The analog world of commercial printing prints dots in varying sizes. The digital world prints in grids of dots. Increasingly, digital printers use techniques that overlap dots to achieve greater variability in dot sizes.
MedicalSeegray scale

Halftone


Halftone

An engraving used to print an illustration, such as in a book or magazine. This word is most common in publishing.

halftone


  • noun

Synonyms for halftone

noun a print obtained from photoengraving

Related Words

  • engraving

noun an engraving used to reproduce an illustration

Synonyms

  • halftone engraving
  • photoengraving

Related Words

  • engraving
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更新时间:2025/1/9 9:43:08