g3togif (was: web fax viewer...)

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Hi,

Frank D. Cringle wrote:
> gert@greenie.muc.de (Gert Doering) writes:
> >Luigi Rizzo wrote:
> >> On the other hand, viewfax does a good job at 1/2 and 1/4 resolution,
> >> so I'll just have a look at what it does.
> >
> >Nothing :) - just throw away every second row. (Interesting, isn't it?)
> 
> Hey! It is simple, but not that simple.

Ooops. Sorry for not remembering correctly. I only remembered that you
experimented with anti-aliasing, and dropped it again.

> Four neighbouring pixels are collapsed into one pixel. If more than
> one of the original pixels was black, so is the result, otherwise it
> is white. I first tried a threshold of 2, but a severe bias to black
> gives better results on typical text images.

I see. Now I know, and will remember :) - thanks for clarifying.

So we should do this as well when scaling faxes and converting to GIF...

gert

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Gert Doering - Munich, Germany      gert@greenie.muc.de
fax: +49-89-3545980     gert.doering@physik.tu-muenchen.de
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