halftoneskärmar
Halftoneskärmar, commonly referred to as halftone screens, are devices or techniques used to convert continuous-tone images into patterns of dots that can be reproduced by printing, photographic or digital processes. They are essential for printing color prints, newspapers, and for generating tonal gradients in digital displays. The fundamental principle of a halftone screen is dot modulation: by varying the size or density of dots in a regular grid, a range of intermediate tones can be simulated. When viewed from a normal viewing distance, the individual dots blend optically to give the impression of continuous tone.
In traditional printing, mechanical halftone screens were attached to hand or computer typesetting machines. Modern halftone
Digital halftone techniques include error diffusion, which spreads the quantization error of pixel values across neighboring