Re: [ft-devel] State of autohinter stem darkening

[Dave Arnold]

On 10/22/2015 1:48 PM, Alexei Podtelezhnikov wrote:
> On Thu, Oct 22, 2015 at 4:43 PM, Dave Arnold <address@hidden> wrote:
> > On 10/22/2015 12:21 PM, Alexei Podtelezhnikov wrote:
> > > On Thu, Oct 22, 2015 at 12:00 PM, Nikolaus Waxweiler <address@hidden>
> > > wrote:
> > > > And gamma correction leads to better results with light text on dark
> > > > background as far as I can see: https://bel.fi/alankila/lcd/
> > > There is a cool image attached to this bug report:
> > > https://bugreports.qt.io/browse/QTBUG-41590
> > >
> > > Gamma correction makes black text lighter and white text heavier,
> > > i.e., has opposite effects, i.e., you cannot use one universal value.
> > I agree with the first part: the effects on black text and white text are in
> > opposite directions.
> > But this is what you need.
> > I disagree with the second part: there IS a single correct value which
> > should be used.
> Again, my monitor is sRGB. Yours is probably too. Are you suggesting
> that this is not good enough?
Sorry, I don't understand where this last question is coming from. An sRGB monitor is expected and 
of course is "good enough." What I'm saying is that once a glyph image is composited in a 
linear space, it needs to be transformed or corrected into something close to sRGB. (My examples 
use gamma 1.8 instead of 2.2, but that is close enough, and in fact deals with some other factors 
that lower the "effective gamma" of high frequency images like text.) Ignoring gamma, 
e.g. by using gamma 1.0, would not be good enough.

-Dave