# [NTG-context] Is it possible to define a custom imposition schema? (sure it is, but how?)

Willi Egger context at boede.nl
Tue May 29 22:21:23 CEST 2012

```To my knowledge the printer will have more hand-work than accepting that e.g. the 2*4*2 or the 2*2*4 scheme is used. - Again, if I understand you correctly, then the folding machine can only do a single fold. So after assembling the section with two folded sheets still a manual fold must be made along the spine. I expect that the assembly is quite unstable if it has to be stitched/sewn.

In the first case one can pick two sheets and fold them twice, resulting in a 16 pages section. Such folded sections are stable for stitching/sewing.  Even more easy  is the 2*2*4 approach, with a single folding over the spine you end up with a section of 16 pages. This kind of section is reasonably stable for stitching/sewing.

Willi
On May 29, 2012, at 9:00 PM, Marco Pessotto wrote:

> Willi Egger <context at boede.nl> writes:
>
>> Hi Marco,
>>
>> If I understand correctly what you need is a system which is basically
>> based on booklet-printing but each booklet should be restricted to 16
>> pages.  In this case you might try
>>
>> \setuparranging[2*2*4]
>>
>> This scheme put two pages on the front and two pages on the backside
>> of a sheet of paper. Then it uses 4 sheets to complete the section.
>>
>> Willi
>
>
> No, the scheme is quite complicated (from 1 to 16) because the pages are
> first folded, then the two *folded* sheets are inserted one into the
> other, and then signature is bound and trimmed.
>
> So the scheme looks so (R means rotated 180°):
>
>
> 13 R | 4 R
> -----------
> 16   |  1
>
>
> 3 R  | 14 R
> -----------
> 2    | 15
>
>
> 9 R  | 8 R
> -----------
> 12   |  5
>
> 7R   | 10R
> ----------
> 6    |  11
>
>
> Yes, that's crazy (if you ask me). As I said, I'll go with the layers
> and a perl helper, the outcome looks almost fine.
>
> Best wishes
>
> --
> Marco
>
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