[cairo] LCD filtering in cairo, use default filter?

Carl Worth cworth at cworth.org
Mon Jan 14 17:23:17 PST 2008

On Mon, 14 Jan 2008 19:28:36 -0500, Behdad Esfahbod wrote:
> I see DEFAULT doing a much better job at Courier New with autohinter at
> very small sizes.

Yeah, that's a font that's just too thin to be usable at small font
sizes. All the stems are less than a full pixel wide. And yes, with
those narrow stems DEFAULT definitely looks much better, (approximates
gray well while LEGACY is a speckled mess of purple, gray, and the
occasional cyan).

> In most other cases I agree that LEGACY looks better
> here.  But then again, I don't use LCD subpixel by default.

Yup. Even with Courier new, as soon as the stems are a full pixel wide
(or more) they show up in sharp black with LEGACY and with cyan
fringes with DEFAULT (to my eyes at least).

And as full-disclosure, my eyes are definitely very accustomed to
reading well-hinted LEGACY-filtered text at small sizes, (stem width's
of exactly one pixel). So I'm definitely trained to see that as "good"
even if just for sake of familiarity.

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