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From: | Dave Arnold |
Subject: | Re: [ft-devel] new CFF engine |
Date: | Sat, 11 May 2013 08:38:04 -0700 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 |
And maybe made configurable from fontconfig like what the Cleartype tuner on Windows 7/8 does.Yes, maybe. However, stem darkening is a font driver property and not to be changed font-wise. Werner
Within the new CFF hinter, stem darkening automatically accounts for font weight. At a given size, the darkening amount is greater for light fonts and less for bold fonts. The most important dependency is on linear blending (or gamma correction) in the compositing of glyph images onto the screen. The stem darkening function assumes blending with a gamma close to 1.8. If linear blending is not used (e.g., gamma 1.0) then black text will appear too dark. This might be a situation where you'd want to disable stem darkening. But white text would suffer. It really is important to use proper blending! -Dave
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