Re: [ft-devel] new CFF engine

[Vernon Adams]

I have been testing the new adobe-Freetype CFF engine, and was wondering if the 
default 'darkness' of stem darkening is a little too high?
How does the width of stems in a font effect the amount of darkness rendered? I 
think someone mentioned that thinner stems will render with relatively more 
darkness than thicker stems? Is that correct? Or is the amount of darkness a 
uniform value across all rendered fonts?

thanks


On 12 May 2013, at 06:39, Nikolaus Waxweiler <address@hidden> wrote:

>> 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
> 
> Thanks for the explanation! I just looked up a test of my monitor where it 
> says that the gamma is somewhere between 2.1 and 2.5 depending on what you do 
> in the OSD menu. How can I tell the CFF engine about that?
> 
> Regards,
> Nikolaus