Hello . Well. First, Keith, I want to thank you for your reply to my message - it was very encouraging and motivated me enough to continue investigation (I'm still convinced WinXP ClearType provides much more readable text output on not-so-highres LCDs than any other technology). Your comments were also very valuable. What I have now : 'reference' (as seen on http://grc.com/cleartype.htm) implementation of 5-level filter. Results are quite promising, although still not on-par with CT (text is a bit more blurry/slightly bolder (sp?) than CT's output). (I could provide results, if somebody is interested). I tend to think this is because either a) MS core TTF fonts supplied with XP probably have some more additional info with proper weighting coefficients (ClearType hints ?). Could someone confirm/deny it ? b) Incorrect/too simple formulae to calculate each subpixel's value distribution. Is there any patent/techdoc info about MS ClearType's used algorithms ? Would it be called 'patent infringement' if such a patent exists and similar technique will be implemented in Xft ? And one more question, this one must probably go to freetype-devel ml, but in case somebody knows - is there any way to use freetype2's grayscale renderer in monochrome mode - without 5-level gray smoothing ? I've looked through code, and simplest solution seems to just modify gray levels table to have 0x00 as first one or two entries and 0xff in others, but would it be correct/enough ? With subpixeled AA there's no need to gray-smooth diagonal outlines - they will be blurred with subpixel filtering anyway. Rendering with 3x horizontal resolution is essential, though, so ft's simple monochrome renderer won't suffice. -- With all the best, yarick at relex dot ru.
