From: "lihb" <lihb@phys.sinica.edu.tw


 Hi,
  \setupoutput[pdftex]
> \usemodule[pre-general]
>
> \setuppapersize
>   [S6][S6]
>
> \setuplayout
>   [width=fit,
>    height=fit,
>    header=32pt,
>    footer=32pt,
      backspace=3cm]
>
> \setupfootertexts[\bf\ss{test}][\bf\ss{\date}]
>
> \def\RedHatLogo%
    {\externalfigure[shadowman-32.png][height=32pt,type=png]}

>
> \definelogo
>   [small logo] [footer] [middle]
     [state=start,command={\RedHatLogo}]

The option middle does not work. I tested all the [footer] locations, but
middle does not show even if the \setupfootertext is commented

> \starttext
> \chapter{test}
>
%\placelogos[small logo]

You do not need to put \placelogos[]. Any logo defined with state=start will
be printed on each page.
>
> \stoptext

As far as I know Pdftex does not support png-files with colors. So please
test your presentation with a black and white figure.

It might help to get the layout of your page correct to place the command
\showframe after \starttext


>    2nd question: change the background of margin
> I have a rightmargin with
>
> \startuniqueMPgraphic{test}
>   picture p ; p := btex TEST etex rotated 90 ;
>   setbounds p to boundingbox p enlarged 1pt ;
>   draw p withcolor 0.8white ;
>   currentpicture := currentpicture
>       xysized (\overlaywidth,\overlayheight) ;
> \stopuniqueMPgraphic
> \defineoverlay[test][\uniqueMPgraphic{test}]
>
> \setupbackgrounds
>   [text]
>   [rightmargin]
>   [background=test]
>
> which is a word "TEST" with grey color and white background,
> how to change the background color?
> I had try 'fill p withcolor darkcyan ;'
> but the background of margin is still white.

I am no wizzard with Metapost. However you might try to save the boundingbox
information into a new path and fill this path with a color. Colors have to
be defined in the preamble. So you will have to tell Metapost what you mean
with 'darkcyan'.

Willi