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Date: Thu, 1 Oct 2015 15:16:33 +0200
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] pcb: Some visual love for the layer groups dialogue
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Precedence: bulk

> > The limit is 150k for the whole message, but obviously, the more you
> > can compress attachments (jpg vs png for example) the better.
> 
>   ...but please don't abuse the JPG format by pressing it into service
> for something other than natural-scene, continuous-tone images.  There
> are far more suitable compression algorithms for line art.  The very
> real advantage is the lack of artifacting that is so visibly annoying
> when people do things like post schematics as JPG files.
> 
>                 -Dave

The old jpeg used sinus curves and removed the high frequencys. I think the new format use another kind of curves possible wavelet which is a similar approach. It work well for smooth images but as you say not good at all for lines.

Nicklas Karlsson