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Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient-like effect. [1] "Halftone" can also be used to refer specifically to the image that is produced by this process.
This effect shows fairly well in the picture at the top of this article. The grass detail and the text on the sign is well preserved, and the lightness in the sky, containing little detail. A cluster-dot halftone image of the same resolution would be much less sharp.
Mezzotint is a monochrome printmaking process of the intaglio family. It was the first printing process that yielded half-tones without using line- or dot-based techniques like hatching, cross-hatching or stipple.
Traditional amplitude modulation halftone screening is based on a geometric and fixed spacing of dots, which vary in size depending on the tone color represented (for example, from 10 to 200 micrometres). The stochastic screening or FM screening instead uses a fixed size of dots (for example, about 25 micrometres) and a distribution density ...
From left to right: The cyan separation, the magenta separation, the yellow separation, the black separation, the combined halftone pattern and finally how the human eye would observe the combined halftone pattern from a sufficient distance. Reason A very useful diagram illustrating roughly how color halftoning works.
In a facsimile system the halftone characteristic is either: . the relationship between the density of the recorded copy and the density of the original, or; the relationship between the amplitude of the facsimile signal to either the density of the object or the density of the recorded copy when only a portion of the system is under consideration.
Text and vector can print at 2400dpi if it only uses one solid color as there will be no halftone dithering, that's why magazine text is so sharp. Images can only print at the equivalent of 300dpi because of the dithering needed for the gradients and mixed colors, although the dithering of the image is printed at 2400dpi (300dpi for images, and ...
Screenless lithography is a reprographic technique for halftoning dating to 1855, when the French chemist and civil engineer Alphonse Poitevin discovered the light–sensitive properties of bichromated gelatin and invented both the photolithography and collotype processes.