\setuparranging values for perfect bound A5 on A3?

[Bruce Horrocks via ntg-context <ntg-context@ntg.nl>]

I have a book to be perfect bound[1] and I'm trying to work out what imposition to use.

The printer would like 4 A5 pages laid out on A3 e.g.

+---+---+
|   |   |
| a | b |
|   |   |
+---+---+
|   |   |
| c | d |
|   |   |
+---+---+

so that he can cut the paper and simply stack a, b, c, & d on top of each other and then put them in the binding machine[2].

If the book is 40 pages long, say, then stack 'a' has page 1 on the top, page 2 on the reverse, then the next sheet has page 3 and 4, and so on down to the last sheet which has page 9 on the front and page 10 on the back. Stack 'b' would have page 11 on the front, 12 on the back and so on, so that each stack has a quarter of the book.

Is this something LMTX can do and if so what combination of \setuplayout and \setuppaper do I need to use? If they can be printed in reverse order then great but I assume the printer can do that fairly easily. If not, is there a recommended external program that can do it?

I've tried \setuplayout[4*2] and XY with 2x2 but neither output is what I need.

Thanks in advance.

[1] glued spine (if that term isn't used outside the UK)
[2] I'm sure it's actually harder than that. :-)

—
Bruce Horrocks
Hampshire, UK

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________