Dithering (image editing)

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Color gradient with 300 colors (without dithering)
Gradient with 16 colors (with dithering)
Gradient with 4 colors (with dithering)
Color gradient with 2 colors (with dithering)

The dithering (from english to dither [ 'dɪðə ] fluctuate,',, 'shake) is a technique in computer graphics to in images with reduced due to technical restrictions color depth , which must be reproduced illusion to produce a greater depth of color. Dithering is a type of dithering , it is also known as error diffusion .

In a dithered image, the missing colors are reproduced using a specific pixel arrangement from available colors, thereby avoiding hard transitions between the colors. The human eye perceives dithering as a mixture of the individual colors.

The most common use of dithering is for color reduction . The examples on the right show gradients with different numbers of colors. From a distance, the differences are barely noticeable.


further dither algorithms

There are a number of different algorithms for dithering , which often also work with an error distribution. Any rounding errors or overflows are transferred to neighboring pixels in order to achieve a finer representation. Examples are:


Comparison of different dithering algorithms using the example of Michelangelo's statue of David
Various halftone methods, the original image on the left, an 8 × 8 halftone screen in the middle, and the Stucki error distribution algorithm on the right

Web links

Commons : Dithering  - collection of images, videos, and audio files