# My issue

I have an A5 pdf that I want to print in order to make a booklet made of folded A4 sheets:

(source)

# My trials

I use this code to generate the pdf-to-be-printed-as-is:

\documentclass[a4paper]{article}
\begin{document}
\includepdf[pages=-,
nup=1x2,
noautoscale,
signature=16,
landscape,
delta=0 0cm]{myA5pdf}
\end{document}


Bonus: a MWE for an 8 pages A5 document

\documentclass{scrartcl}
\usepackage[a5paper,twoside]{geometry}
\begin{document}
\begin{Huge}
1\clearpage
2\clearpage
3\clearpage
4\clearpage
5\clearpage
6\clearpage
7\clearpage
8\clearpage
\end{Huge}
\end{document}


However, I think I do not understand the meaning (and the functioning) of the signature option.

I have read the documentation and this post that say:

signature Creates booklets by rearranging pages into signatures and setting nup=1x2 or nup=2x1, respectively. This option takes one argument specifying the size of the signature, which should be a multiple of 4.

but the meaning is then no clearer for me.

# My questions

So my questions are:

1. What is the meaning of signature?
2. Which argument (multiple of 4) should I chose:
• when myA5pdf has 4*n pages?
• when myA5pdf has 4*n+2 pages?
• Have you done a web search for 'signature' 'book binding'. It might be informative... – Leeser Nov 6 '15 at 11:08
• You're right: I had looked for 'signature' + 'pdfpages' only (and you can imagine which results I did got) since I didn't knew that it had a meaning particularly related to bookbinding. But I could have though of it, I was more clever (-; thank you! – ebosi Nov 6 '15 at 12:34

In the context of pdfpages, the argument of the option signature refers to the amount of pages of the original pdf you want to have per section (hence a multiple of 4). Here the example of the influence of signature when importing a 16 pages document:
Hence, if the booklet has 4n pages, use signature=4n. If the booklet has (4n+2) pages, use signtuare=4(n+1) and 2 additional blank pages will be added to make up the balance.