Re: feeble anti-aliasing
Re: feeble anti-aliasing
- Subject: Re: feeble anti-aliasing
- From: Greg Guerin <email@hidden>
- Date: Wed, 7 Oct 2009 16:19:53 -0700
Colin Howarth wrote:
I don't know enough about what Quartz is doing. For instance, does
it calculate the coverage
of a pixel (i.e. the fraction covered) as a float and then use that
times 255 for pixel values
(for black on white) giving 256 steps. Or does it quantize down to
16 steps, for example?
I expect it's using a double and compositing with alpha blends and
all the rest :-)
First, it's usually doing sub-pixel anti-aliasing. Run the
DigitalColor Meter app in /Applications/Utilities. Second, the type
and amount of anti-aliasing it does is determined by the OS version.
10.6 has different defaults and options than 10.5 or 10.4 (e.g. the
smoothing options in the Appearance prefpane). Finally, it's
conceivable that anti-aliasing is done by a GPU. Again, support for
that would depend on OS version.
So to reiterate what Ken Ferry wrote, there's too much information
missing.
-- GG
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