The Tuner will walk you through a series of side-by-side text renderings, asking which of them looks best, a bit like an eye doctor determining the parameters for your prescription eyeglasses. You have to zoom in pretty close to see the effect: The FontSmoothingGamma parameter controls the darkness of the smoothing and accepts values between 10. Examining Smoothing Parametersįont Smoothing is controlled by four registry values inside HKCU\Control Panel\Desktop. In contrast, if you zoom into the ClearType examples in Edge 86 and Firefox 80 you can see subpixel smoothing at work, with tiny colored fringes smoothing the edges of the characters. Notably, the IE11 rendering is pixel-for-pixel identical regardless of Windows settings– it renders with grayscale subpixel smoothing even when smoothing is off or ClearType is enabled. Here’s a quick chart showing the impact of each setting across three browser engines: Windows has three levels of font smoothing: Off, Basic/Standard, and ClearType. Investigation reveals that the problem here is that Edge and Firefox are respecting the system’s font smoothing setting, but IE11 is ignoring it. Most people think the text for Edge looks awful, with unexpectedly chunky letters and irregular kerning, but the text for IE11 looks pretty good.
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