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I have posted a few posts of screenshots of tests with Werner Lemberg's work-in-progress 'ttfautohint' tool.
The aim of my tests is to compare Windows GDI and DirectWrite output of ttfautohint hinted fonts against the original hinted fonts.
In general the tool is working well, but naturally some glitches to still iron out. Lazy person auto-instructing for truetype fonts, comparable to manual instructing, could be in reach.