Instead of perturbing each pixel in the input image at random, we can choose to dither by a predetermined amount depending on the pixel’s position in the image. This can be achieved using a threshold map; a small, fixed-size matrix where each entry tells us the amount by which to perturb the input value , producing the dithered value . This matrix is tiled across the input image and sampled for every pixel during the dithering process. The following describes a dithering function for a 4×4 matrix given the pixel raster coordinates :
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OS 8.1.1 also includes the latest long-term support Hardware Enablement stack from Ubuntu, including Linux 6.17. This brings the latest Intel graphics drivers, better power management for AMD hybrid GPUS, performance improvements for gamers, support for more ARM devices, and more.