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From: Han The Thanh <thanh@informatics.muni.cz>
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Subject: Re: transparent PNG on a coloured background
Date: Tue, 9 Jan 2001 16:16:28 +0100 (MET)
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Hi,

> > I now have a problem with a logo (PNG file) which is round and has a
> > transparent background. I simply insert it using \externalfigure and the
> > background of the transparent parts is white (not the colour of that
> > page).
> > 
> > Tobias
> 
> I remember having this problem with [pdf]latex too.

transparency in pdf is not support in the current version of pdf yet (1.3,
acrobat 4.x), so the alpha channel of png figures will be ignored.

Thanh