> >>> However, I don't understand where the differences come from. >>> Nothing in the hinting instructions added by ttfautohint is >>> specific to ClearType. It uses a large number of twilight points >>> which is probably unusual a bit, but this doesn't explain how the >>> asymmetry can come into existence. >> >> Well i have no technical knowledge of the rendering stuff behind >> Cleartype or Freetype, but my eyes tell me that they render the same >> TT instructions differently > > Mhmm. Up to now I've *never* seen a font rendered with FreeType which > shows such a large deviation from the Windows font engine. I believe > that FreeType's output is quite trustworthy.
heh. Really? Depends what you mean by 'large deviation' i guess. I only ever seem to see differences between Windows font rendering and the other OS's :) > > Maybe there are problems with my bytecode. Well - your bytecode seems to work fine for hinting under Freetype, but not under Windows GDI. You should probably look at the newest screenshots at http://code.newtypography.co.uk I tested Ubuntu Font & Droid Serif with the Windows' 'system font viewer' on XP and Win7, both with GDI-Cleartype. Some very glitchy stuff happens with the ttfauto hinted fonts at larger sizes - 36pts on Ubuntu Font, 48pts on Droid Serif. I have tested and replicated those glitches on different PC's so they are for real! :) Must do some full waterfall tests to see what else is happening at other sizes. More testers and more eyes would be good too. > >>> Perhaps I can activate my contacts to the font people at Microsoft, >>> asking for help in case the rendering problems you observe are also >>> present in Win7. >> >> That would be good. Any light shed on how Cleartype utilises TT >> instructions would be great. > > But the bad rendering happens with and without ClearType, right? The rendering glitches seem to be specific to the GDI-Cleartype rendering, and absent (as far as i can see) from the new (FireFox4 & IE9) DirectWrite-Cleartype rendering. -vern
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