Re: gEDA-dev: Drawing updates for gschem

[Peter Clifton <pcjc2-at-NOSPAMcam_dot_ac_dot_uk>]

On Wed, 2007-11-07 at 17:25 +0000, Kai-Martin Knaak wrote:
> On Wed, 07 Nov 2007 09:17:21 +0000, Peter Clifton wrote:
> 
> >> Do I smell anti aliasing and sub pixel smoothing? If so, I'd accept a
> >> few additional glitches ;-)
> > 
> > As far as I know, the sub-pixel rendering is only ever used for fonts.
> 
> How does inkscape achieve smooth edges then? (Just curious)

Its anti-aliasing, not sub-pixel rendering. We're probably just thinking
of different terms.

The anti-aliasing results in wider lines, but pixels at the edge are
some grey value between the background and the solid line colour.

Sub-pixel rendering for fonts on LCD screen utilises the RGB|RGB|RGB|
(example) banding of colours on the LCD to more accurately position the
rising portions of glyphs.

A white dot could be:

|...|RGB|...|

Or shifted by 1/3 pixel:

|...|.GB|R..|

And should in theory still look like a white dot. (In fact, it is
programmed as one cyan, and one red pixel next to each other).

Best wishes,

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)



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