Random DitheringRandom Dithering is a method of dithering which can be used for converting color or gray scale images into monochrome (black and white) images.
Random Dithering works by choosing a different random value for each pixel in the image. If the pixel is more intense (usually a higher number) than the random value, it becomes white, if not, it becomes black.
Random Dithering tends to produce images with a lot of high frequency noise artifacts (like a badly tuned TV picture), and so is usually not appropriate unless you actually wish to achieve this type of special effect. However, there are a few cases (generally very simple images with little detail - such as a picture containing a smooth gradient of grays from black to white), where random dithering may actual produce better results than other methods of dithering.
The picture below shows a gray scale image, and the results of converting it to monochrome using Random Dithering:
To give you an idea of what the detail of image looks like after Random Dithering, here is the monochrome image greatly enlarged so that you can see the individual pixels:
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