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Hardware graphics are used to improve text rendering. Specifically, with DirectWrite, the text 'antialiased' with grey pixels to smooth the curves and letters are placed precisely with 'sub-pixel positioning'. Some of this technology in general has been in use for years, but the new implementation adds the grey pixels to account for both vertical and horizontal curves.
This shows a single word, magnified threefold to better illustrate the graphics of sub-pixel positioning.