Dithering Generator
Fast, accurate and free online ditheru generator tool running directly in your browser.
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Other tools you may find usefulDither generator - pixel retro effect on any image
Dithering is a digital image processing technique that simulates missing colors or shades of gray by arranging available color pixels in a pattern. Historically used in 8-bit printing and displays, today popular as an artistic effect.
Dithering algorithms
Floyd-Steinberg: propagation of quantization error to neighboring pixels (right, left-bottom, bottom, right-bottom). The most natural effect, popular in conversion to 1-bit graphics. Bayer (Ordered Dithering): fret matrix (2×2, 4×4, 8×8) – regular pattern, retro/halftone effect. Atkinson: softer propagation, bright areas "burn" - Apple Macintosh styling.
Color reduction modes
Monochrome (1-bit): black and white with dithered grays - a printing classic. 2-color: background + 1 color (e.g. white + blue). Limited palette: 4, 8, 16 colors (8/16-bit retro games). Custom HEX palette: you provide a list of colors, dithering adjusts the image to this palette.
Applications of dithering
Generative art and posters with a retro aesthetic. Converting photos to 1-bit files (e-ink, thermal printers, plotters). Halftone effects for press graphics. Pixel art with a limited palette (demoscene). Optimization of GIF graphics (256 colors + dithering = better quality). E-ink displays: native 1-bit with dither.
Dithering quality parameters
Input resolution: the higher the DPI, the more subtle the effect. Threshold for Bayer: value 50% = standard; higher = brighter image. Propagation factor for Floyd-Steinberg: 1.0 = standard, <1.0 = less aggressive propagation. Bayer matrix size: 2×2 (coarse pixelization) vs 16×16 (subtle).
Frequently asked questions
What is the difference between dithering and posterization?
Posterization: reduces the number of tonal levels - hard transitions between colors ("poster" effect). Dithering: reduces colors but maintains the apparent tonal gradation by arranging pixels. Dithering gives a more natural look; posterization – a more graphic, flat style.
Why did old computer games use dithering?
CGA (IBM PC, 1981): 4 colors simultaneously. EGA: 16 colors. Amiga HAM: 4096 colors but with limitations. Dithering allowed the simulation of more shades than the available palette. Classics: Prince of Persia, Monkey Island, King's Quest - characteristic dithered backgrounds.
How does dithering work in offset printing?
Offset printing is binary (with or without ink). Halftone: an image divided into a grid of points of different sizes (halftone). Dithering: An alternative technique with fixed points on an irregular grid. Laser/inkjet printing: 600+ DPI allows for subtle dithering invisible to the naked eye.
How to achieve a "vintage zine" effect by dithering?
Convert photo to black and white (desaturate). Increase contrast (+30%). Apply Floyd-Steinberg dithering in 1-bit mode. Optional: blur slightly before dither for a softer effect. Scale to low resolution (200px) and enlarge with "nearest neighbor" interpolation.
Does dithering reduce file size?
Yes for 1-bit and indexed formats (GIF, PNG-8). 1-bit PNG after dithering is much smaller than the original photo. Dithering up to 8 colors + PNG-8 = very small file with acceptable quality for simple graphics. For JPEG: dithering will not reduce the size.
Related tools: pixel art generator, image glitch effect and image format converter.