Dithering in its simplest form can be understood by observing what happens when we quantise an image with and without modifying the source by random perturbation. In the examples below, a gradient of 256 grey levels is quantised to just black and white. Note how the dithered gradient is able to simulate a smooth transition from start to end.
The art of the deal.
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The pharmacy worker said she did not remember her first month in hospital, before she had her hands amputated
The trust said just 133 adult salmon were recorded returning to spawn in 2022 - the lowest figure since monitoring began in 1990.