Another way to approach dithering is to analyse the input image in order to make informed decisions about how best to perturb pixel values prior to quantisation. Error-diffusion dithering does this by sequentially taking the quantisation error for the current pixel (the difference between the input value and the quantised value) and distributing it to surrounding pixels in variable proportions according to a diffusion kernel . The result is that input pixel values are perturbed just enough to compensate for the error introduced by previous pixels.
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Windhawk makes me think about the future of Windows, too. Microsoft is talking about a “Windows Baseline Security Mode” that PCs will be in by default, only letting properly signed software run and forcing apps to ask for your permission when they access your files, webcam, microphone, and other resources. According to Microsoft, this will only be a default — you can choose to opt out.