Intuitively, it’s not too difficult to understand why this is the case. Remember that error-diffusion works in response to the relationship between the input value and the quantised value. In other words, the colour palette is already factored in during the dithering process. On the other hand, ordered dithering is completely agnostic to the colour palette being used. Images are perturbed the same way every time, regardless of the given palette.
// document_start means these listeners are in place before any element exists
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But analysis of Cabinet Office documents by the BBC has found government departments spent around £101m from April 2023 to June 2025.