halftone
half·tone
H0025400 (hăf′tōn′, häf′-)halftone
(ˈhɑːfˌtəʊn)half•tone
(ˈhæfˌtoʊn, ˈhɑf-)n.
halftone
Noun | 1. | halftone - a print obtained from photoengraving |
2. | halftone - an engraving used to reproduce an illustration |
单词 | halftone | |||||||||
释义 | halftonehalf·toneH0025400 (hăf′tōn′, häf′-)halftone(ˈhɑːfˌtəʊn)half•tone(ˈhæfˌtoʊn, ˈhɑf-)n. halftone
halftonehalftonehalftone[′haf‚tōn]halftone(graphics)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. halftoneIn 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
HalftoneHalftonehalftone
Synonyms for halftone
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