Ordered DitheringOrdered Dithering is a method (with various variants) of dithering which produces monochrome (black and white) images.
Ordered Dithers work by imposing different patterns (and therefore they tend to produce many pattern artifacts), depending on the color being dithered.
A particularly common type of Ordered Dithering is Bayer Dithering.
The picture below shows a True Color image, and the results of converting it to monochrome using Ordered Dithering:
To give you an idea of what the detail of image looks like after Ordered Dithering, here is the monochrome image greatly enlarged so that you can see the individual pixels:
Ordered Dithering can also be used when reducing the color depth of an image. For example, when converting True Color image into a color-safe palette image, Ordered Dithering can be used to avoid large smooth areas of color which would otherwise spoil the photographic effect of an image.
The picture below shows a True Color image, and the results of converting it to the color-safe palette, with and without using Ordered Dithering:
To give you an idea of what the detail of image looks like after Ordered Dithering, here is the color-safe image greatly enlarged so that you can see the individual pixels:
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