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Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen
From: |
Markus Trippelsdorf |
Subject: |
Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen? |
Date: |
Wed, 3 May 2017 15:36:46 +0200 |
On 2017.05.03 at 09:20 -0400, Alexei Podtelezhnikov wrote:
> >> So, how did you get the values used currently as the default? Are there
> >> other
> >> properties besides the two mentioned, that helped you to "calculate" such a
> >> filter? Or did you just try different variants and choose the one that
> >> looked
> >> better for you?
>
> Without filtering, an outline covers unequal amounts of color
> channels, which is visible as color fringes especially with thin
> stems. So filtering should enforce equality between color channels.
> The box fiilter (aka light) "00 55 56 55 00" is the absolute minimum.
> The light filter is actually my favorite. The default filter
> (suggested by Dave Arnold from Adobe) "08 4d 56 4d 08" is only
> slightly different from the light filter. It is slightly wider and
> blurrier than the light filter and, as such, more tolerant to
> incorrect gamma setting.
Apropos gamma setting. CFF fonts will get linear blended (with stem
darkening) by default in upcoming Qt 5.9:
http://code.qt.io/cgit/qt/qtbase.git/commit/?h=5.9&id=21f27c9a4
--
Markus
- [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Vladimir A . Pavlov, 2017/05/03
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Markus Trippelsdorf, 2017/05/03
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Nikolaus Waxweiler, 2017/05/03
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Vladimir A . Pavlov, 2017/05/03
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Alexei Podtelezhnikov, 2017/05/04
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Nikolaus Waxweiler, 2017/05/04
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Markus Trippelsdorf, 2017/05/05
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Nikolaus Waxweiler, 2017/05/05
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Markus Trippelsdorf, 2017/05/05
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Nikolaus Waxweiler, 2017/05/05
- Re: [ft-devel] How the new lcd filter coefficients in 2.6.2 were choosen?, Markus Trippelsdorf, 2017/05/05