- Art a tone or shading between light and dark
- Music semitone
- a technique of representing shadings by dots produced by photographing the object from behind a fine screen
- a photoengraving so made
- A tone or value halfway between a highlight and a dark shadow.
- 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.
- Music See semitone.
(third-person singular simple present halftones, present participle halftoning, simple past and past participle halftoned)
halftone - Computer Definition
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 FREQUENCY Shades of Gray or --At printer resolutions-- Cell Colors 300 dpi 1200 dpi 2400 dpi 4x4 16 150 lpi 300 lpi 600 lpi 8x8 64 38 lpi 130 lpi 300 lpi 16x16 256 19 lpi 75 lpi 150 lpi