On Fri, 23 Nov 2007 18:55:37 +0200
Vyatcheslav Yatskovsky <[EMAIL PROTECTED]> wrote:

> Hello,
> 
> How can I center the image on a page? I want images to cover the page 
> completely, and since they have proper size (roughly A4), I only need them to 
> be centered. Now they are stuck to the top, leaving a gap on bottom (and same 
> for left-right).
> 
> I have the following script (note my Lua trick to process images in a batch). 
> Image names are "Image00001.png" and so on.
> 
> 
> %engine=luatex
> \setuplayout
>   [footer=0mm, header=0mm,
>   topspace=0mm, backspace=0mm,
>   leftmargin=0mm, rightmargin=0mm,
>   location=middle,
>   height=fit, width=fit]
> 
> \starttext
> 
> \startluacode
>   for n = 1, 9 do
>     tex.print(string.format("\\externalfigure[Image%05d.png]", n)); 
>   end
> \stopluacode
> 
> \stoptext

\def\fivedigits#1%
  {\ifnum#1<10000 0\ifnum#1<1000 0\ifnum#1<100 0\ifnum#1<10 0\fi\fi\fi
\fi\number#1}

\dorecurse{9}
  {\startTEXpage[width=210mm,height=297mm]
   \centeredbox{\externalfigure[Image-\fivedigits\recurselevel]}
   \stopTEXpage}

Wolfgang
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