# Halftone

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## Halftone

An engraving used to print an illustration, such as in a book or magazine. This word is most common in publishing.
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Comparisons of various methods (advantages (+), moderate (~), shortcomings (-), unknown Quality Robustness Complexity Capacity [1] ~ + ~ - [2] ~ - ~ - [3] - + + - [6] ~ - + ~ [7] + ~ + ~ [10] + - - ~ [11] + - ~ ~ [12] + - + ~ [14] x + ~ x [19] x x ~ ~ [20] x + - x [21] x - + - [22] ~ + - ~ [23] x ~ - ~ ICPT + - ~ + Additional feature (s) [1] Inverse halftoning [2] Reversible Data Hiding [3] Visual cryptography.
La figura 5 muestra los resultados de halftoning usando las matrices de umbral de las figuras 3 y 4.
Cabe mencionar que el metodo de difusion de error pertenece a halftoning FM, por la naturaleza de su proceso.
Este metodo de halftoning fue desarrollado por Knuth [8], tiene como objetivo conservar las buenas caracteristicas del metodo de difusion de error mientras que tambien ofrece un paralelismo sustancial.
Puesto que hay 64 clases, el algoritmo completa el halftoning en 64 pasos.
El analisis espectral de las imagenes de halftone generadas por el metodo de difusion de error muestra que su frecuencia principal es mas alta que la de otros metodos de halftoning [11].
La figura 17 muestra resultados de halftoning usando el metodo de Levien con los filtros F mostrados en la figura 16, con ganancias G=0.5 y G=0.9.
In conventional halftoning, Parker explained, at the elemental level a 50% screen in a given square group of pixels would show a dark patch over half the pixels in the center of the square.
Another quality halftoning method, error diffusion (the concept for which dates from the mid-1970s), Parker said "produces a very nice pattern" but exists simply as an algorithm rather than a screen.
Error diffusion does have built-in sharpening that makes images more appealing, Parker conceded, adding that many consider it "just about the best halftoning technique" for laser-printed images.
At RCT, Baker said the halftoning software can indeed be plugged into midrange and high-end imagesetters and that he is talking to vendors of 2,500-dpi output devices.

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