oyster wrote:
> just like what we can do with a real printer
> 
> for example, I often put every 4 pages from a pdf file onto one A4 page,
> 
> 1. the 4 pages is arranged as
> +--------+---------+
> |    1    |     2   |
> +-------+---------+
> |    3   |     4   |
> +------+----------+

If you browse the figures in the iText book, you'll find this:
http://www.flickr.com/photos/itextinaction/4330324278/

> 2. every original page is scaled to fit the 1/4 A4 space as possible as it can
> 
> 3. then the new pdf is saved
> 
> any hints for the functions to be used?

As you can see, the title of the image on Flicks is "6.5"
and it has the caption "N-up copying: combining multiple pages
onto one page"

This means you'll find an example on how to do this in chapter 6
of the book, more specifically in section 6.2.3, entitle "N-up
copying and tiling PDF documents"

See http://itextpdf.com/book/
-- 
This answer is provided by 1T3XT BVBA
http://www.1t3xt.com/ - http://www.1t3xt.info

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