3,897
edits
Changes
Jump to navigation
Jump to search
m
< [[Structurals]] | [[Visuals]] >To impose means to place pages on a bigger sheet in such a way that one can fold and cut the sheet to get a booklet or something similar. Here are some examples:
==What is Imposition?==* Placing four A5 pages on both sides of an A4 sheet: 1 and 4 on the back, 2 and 3 on the front.* Placing 64 inner pages of a book on one printing sheet, to produce one signature.* One of those brochures made by folding an A4 sheet into three pieces. One could typeset this brochure as two pages with three columns each, or once could make six pages and impose them.* Printing address labels on an A4 sheet, eight labels per sheet.
To impose means to order pages on a bigger sheet In general, imposition is accessed in a wayConTeXt using {{cmd|setuparranging}}, that you get a booklet (or something similar) with correct page order after foldingfrom the command line as follows:<pre>context --pdfarrange=..In the simplest case you impose four A5 pages on both sides of an A4 sheet.</pre>
In a print shop it could be that you've to place 64 inner pages of a book on one printing sheet. For private use you could want to zigzag-fold an A4 sheet as a brochure that fits nicely in a business envelope. You could make two pages with three columns each, or you could make six pages and impose them.== Imposition schemas ==
Another "style" of imposition is to place several identical templates on one sheet, e.g. labels. ==What can ConTeXt do for me?= Default schemas ===
You can access this feature via* <cmd>setuparranging</cmd>* <tt>texexec --pdfarrange=...</tt>* [http://www.ntg.nl:8061/impose.pdf online interface]{{todo|some graphical examples}}
{{todo|some graphical examples}}===XY schema===
==More==Beware, you need to set up your XY arranging in the right order:
Hraban needed a "3SIDE" schema to fit three "filius" planner pages on one A4 sheet. Willi wrote it:
Use it like this:<texcode>\starttext \definepapersize [filius][width=92mm, height=172mm]dorecurse{16}{\setuppapersize [filius]getbuffer[A4,landscapeFakepage]\setuparranging [3SIDE]page}\setuplayout [location=middle, alternative=singlesided, grid=no, marking=on, leftmargin=10mm, leftmargindistance=0mm, topspace=2mm, header=4mm, footer=0mm, width=77mm, height=166mm]stoptext</texcodecontext>
\setupoutput[pdf]
texexec context --arrange yourFilename
→Custom imposition schema: elaborated a bit more
ConTeXt has some built-in imposition schemas (see "arranging pages" in the manual):
* 2UP: 2 pages next to each other, n sheets arranged for a single booklet* 2DOWN: 2 pages above each other, n sheets arranged for a single booklet* 2SIDE : 2 pages per form, side by side in pagination order , single sided only (no real imposition, only paper saving)* 2TOP : 2pages above each other, single sided only*2TOPSIDE: 2 odd pages on one side, two even pages verso, above each other* 2*2 : section: one sheet 2 x 2 pages = 4 pages (2 pages per form, for single sheets with front and back)* 2**2 : section: one sheet 2 x 2 pages = 4 pages (2 pages per form, for book ordering)* 2*4 : section: one sheet 2 x 4 pages = 8 pages (4 pages per form, 2x2 pages head to head)* 2*8: section: one sheet 2 x 8 pages = 16 pages* 2*16 : section: one sheet 2 x 16 pages = 32 pages* 2*4*2 : section of 16 pages: 2 sheets, 4 pages front and backside* 2*2*4 : section of 16pages: 4 sheets, 2 pages front and backside* XY ''(not mentioned in the manual)'' : one sheet with x rows and y columns, you can control the number with [[{{cmd:setuppaper|\setuppaper]]}}[nx=...,ny=...,dx=...,dy=...]
"form" means "one side of a sheet".
<texcode>
\unprotectsetuppapersize[A7][A4,landscape]\setuppaper[nx=4, ny=2] % New must come before \setuparranging!\setuplayout[page ][location=middle, marking=on]\setuparranging [XY]</texcode> Here’s an example for [[Labels]]. ===Testing schemas=== Here's a convenient test file to help choose a schema or write a new one: <context source=yes>\setuppapersize[A9, landscape][A7, landscape] % the schema being tested\setuparranging [2*4] % text describing the schema being tested, to print on the pages\def\Style{[2*4]} % Visuals\setupbodyfont[ss,10pt] \setuplayout [margin=0pt, width=fit, header=2.8ex, footer=2.8ex] \setuppagenumbering [alternative=doublesided,location=footer]\setupheadertexts[\CONTEXT\ imposition scheme 3SIDE by Willi Egger 2003-07-21test]
\installpagearrangement 3SIDEshowframe {\dosetuparrangement{3}{1}{6}{4}{2}% \pusharrangedpageTHREESIDE\poparrangedpagesAB\relax}setupbackgrounds [text][text][background=color,backgroundcolor=lightgray]
\def\pusharrangedpageTHREESIDE#1% Willi's approach {\doglobal\increment\arrangedpageN \reportarrangedpage\arrangedpageN \ifcase\arrangedpageN \or \handlearrangedpageXandY{#1}000\arrangedpageA % 1 \or \handlearrangedpageXandY{#1}010\arrangedpageA % 2 \or \handlearrangedpageXandY{#1}020\arrangedpageA % 3 \or \handlearrangedpageXandY{#1}000\arrangedpageB % 4setupcolors [state=start] \or \handlearrangedpageXandY{#1}010\arrangedpageB % 5Where the block of pages is placed on the sheet \or \handlearrangedpageXandY{#1}020\arrangedpageB % 6 \poparrangedpages(Not relevant in this example, but relevant if there is space left over.) \fi}setuplayout [location=middle,marking=on]
\protectstartbuffer[Fakepage]</texcode> \strutYou can use this code simply in your environment file. The other schemas are in <tt> \blank \midaligned{\Style} \vfill \midaligned{This is page-imp.tex</tt>.\recurselevel} \vfill\stopbuffer
=== Rearranging existing PDF s===
ConTeXt is also handy when you need to '''rearrange an existing pdf''' into a booklet. This is a trial-and-error solution by Mari for rearranging an A4 pdf file into 2*8 spreads on A3 sheet (-> A6 pages when printed and cut). The texexec.tex file that was created by the first tries with <tt>texexec --pdfarrange</tt> (which didn't seem to have enough options) was a great help while working towards this solution.
Not sure about the margins on the final A6 pages (the original has equal left and right margins, some extra inside margin might be a good thing), but at least otherwise this seems to do the trick:
\setuppapersize[A6][A3] %individual page A6 size, print size A3
\setuparranging[2*8,rotated] %makes an 8 page gathering when folded (duplex printing!)
\setuplayout
[backspace=0pt,
</texcode>
For proofing one sometimes wants to pick just some pages and when the original is A5, it is kind of handy to put them side-by-side for proofing. The command {{cmd|filterpages}} allows you to define exactly what pages are needed. Be warned, though, that the page numbers refer to the pages in the pdf file, not the page numbers.
<texcode>
\setuppapersize[A5][A4] %individual page A5 size, print size A4
\setuparranging[2SIDE,rotated] %2 pages side by side, rotated to landscape to fit portrait A4
\setuplayout
[backspace=0pt,
topspace=0pt,
width=middle,
height=middle,
location=middle,
header=0pt,
footer=0pt]
\setuppagenumbering[alternative=doublesided]
\starttext
\filterpages
[file.pdf][2,5,16:19][width=0pt] %picks pdf pages 2, 5, and 16-19.
\stoptext
</texcode>
For more information, see the article on [[Including pages from PDF documents]].
=== Custom imposition schema===
You can create a new imposition schema to meet your needs. To do so, take a look at the imposition definitions stored in <code>page-imp.mkiv</code> and find the closest one to work with. You can access the file online:
https://source.contextgarden.net/tex/context/base/mkiv/page-imp.mkiv?search=installpagearrangement
Let's say we want this page arrangement on one sheet (R = page upside down):
<pre>P4 P1
R3 R2</pre>
This is a mirrored/reversed version of {{cmd|setuparranging}}<code>[1*4]</code>, which gives:
<pre>R1 R4
P2 P3</pre>
<context source=yes>
% Adapted from page-imp.mkiv
\installpagearrangement 1*4*reversed
{\dosetuparrangement{2}{2}{4}{3}{3}% X,Y,Total,hcutmarks,vcutmarks
\pusharrangedpageFOURSINGLESIDEDFOLDEDREVERSED\poparrangedpagesTWO\relax}
\def\pusharrangedpageFOURSINGLESIDEDFOLDEDREVERSED#1%
{\advancearrangedpageN
\reportarrangedpage\arrangedpageN
\ifcase\arrangedpageN
\or \handlearrangedpageXandY{#1}010\arrangedpageA % 1 rot,hskip,vskip
\or \handlearrangedpageXandY{#1}111\arrangedpageA % 2
\or \handlearrangedpageXandY{#1}101\arrangedpageA % 3
\or \handlearrangedpageXandY{#1}000\arrangedpageA % 4
\poparrangedpages
\fi}
\setuppapersize [A10][A8]
\setuparranging [1*4*reversed]
\setuplayout [margin=0pt, width=fit]
\showframe
\starttext
\dorecurse{4}{\vbox to \textheight{\vfill\midaligned{\tfd ABC}\vfill}\page}
\stoptext
</context>
If it is necessary to have a different imposition scheme for the second page it is possible to create an arrangement that spans two physical pages. As an example the following schema arranges the pages like this
<pre>P4 P1
R3 R2
P5 P6
P7 P8</pre>
<context source=yes>
\installpagearrangement 1*4*reversed*1*4
{\dosetuparrangement{2}{2}{4}{3}{3}% X,Y,Total,hcutmarks,vcutmarks
\pusharrangedpageFOURSINGLESIDEDFOLDEDREVERSED\poparrangedpagesAB\relax}
\def\pusharrangedpageFOURSINGLESIDEDFOLDEDREVERSED#1%
{\advancearrangedpageN
\reportarrangedpage\arrangedpageN
\ifcase\arrangedpageN
\or \handlearrangedpageXandY{#1}010\arrangedpageA % 1 rot,hskip,vskip
\or \handlearrangedpageXandY{#1}111\arrangedpageA % 2
\or \handlearrangedpageXandY{#1}101\arrangedpageA % 3
\or \handlearrangedpageXandY{#1}000\arrangedpageA % 4
\or \handlearrangedpageXandY{#1}000\arrangedpageB % 5
\or \handlearrangedpageXandY{#1}010\arrangedpageB % 6
\or \handlearrangedpageXandY{#1}001\arrangedpageB % 7
\or \handlearrangedpageXandY{#1}011\arrangedpageB % 8
\poparrangedpages
\fi}
</context>
The <code>\arrangedpageA</code> and <code>\arrangedpageB</code> are box registers that you can use to build up your desired output pages. They actually go up to <code>\arrangedpageH</code>.
''Note:'' if your imposition scheme needs more than eight physical pages see below [[#Imposition_by_signatures|Imposition by signatures]] on how to interface with an external imposer program.
As you can see in
https://source.contextgarden.net/tex/context/base/mkiv/page-imp.mkiv?search=poparrangedpages.+
there are various alternative definitions of <code>\poparrangedpagesAB</code> that manipulate to box registers in different ways to output the desired imposition. The macro <code>\installpagearrangement</code> makes the generic <code>\poparrangedpages</code> use one of those alternatives (in this case <code>\poparrangedpagesAB</code>).
== Cut marks ==
ConTeXt also allows to place cut marks. This can be controlled using the <tt>marking</tt> option of [[{{cmd:setuplayout|\setuplayout]]}}; possible values are:
* '''on''' show cut marks and page number
== Caveat: common troubles ==
Note that some features (e.g. table of contentcontents, internal references) are always disabled in imposition mode. So, they will not be included in the pdf if you ask for imposition.To get rid of this you can use the "arrange" key for texexecthe <code>context</code> command.
<texcode>
</texcode>
This will run the document at first without page arrangment arrangement and impose the pages in a separate run after table of contents etc are created. In '''SciTe/WinConTeXt''' you can run this command by choosing ''Process and Arrange'' in the ''Tools'' menu in SciTe.
== Getting the last page of a Booklet ==
When you use imposition to print a booklet you want to put something on the very last page, the <code>quadruple</code> pagebreak did not always fill the remaining pages untill until you get a quadruple number of pages.
<texcode>
\stoptext
</texcode>
== Adding pages for imposition signature ==
With `\setuppagenumbering[alternative=doublesided`, there will always be an even number of pages. If you need to always have a multiple of four pages, use `\page[quadruple]` at the end of the document:
<texcode>
% Enable doublesided; there will always be an even number of pages
\setuppagenumbering[alternative=doublesided,location=right]
\starttext
\completecontent
\startchapter[title={A Chapter}]
Text of chapter 1
\stopchapter
\startchapter[title={Another Chapter}]
Text of chapter 2
\stopchapter
% Make sure there are a multiple of four pages in the document
\page[quadruple]
\stoptext
</texcode>
''Is there is a case where the complex solution in the next section would be necessary?''
== Imposition by signatures ==
Sometimes you want a booklet, but the pages are too many to be folded together. This is true especially when the number of pages rises above 80. So you need to pass the output PDF to an imposer, like pdfjam or psbook or pdfpages. The problem is that you need to get the "right" number of pages.
E.g., if the original pages are 128, no problem, the signature is 64 and you can impose it without problems.
But, if the original pages are 129, the optimal signature is 44, so
you need to add 3 pages during the PDF compiling.
First, create the following imposer.lua file
<pre>
-- translated from perl to lua. Original code is in
-- http://theanarchistlibrary.org/docs/altools-6.6.tar.gz
local maxsignature = 80 -- define the maximum of the signature
local minsignature = 20 -- define the minimum of the signature
function optimize_signature(pages)
local originalpages = pages
-- be sure we don't mess up
assert(numberpage ~= 0, "I can't work with 0 pages")
--set needed pages to and and signature to 0
local neededpages, signature = 0,0
-- this means that we have to work with n*4, if not, add them to
-- needed pages
local modulo = pages % 4
if modulo==0 then
signature=pages
else
neededpages = 4 - modulo
end
-- add the needed pages to pages
pages = pages + neededpages
-- give a try with the signature
signature = find_signature(pages)
-- if the pages, are more than the max signature, find the right one
if pages>maxsignature then
while signature<minsignature do
pages = pages + 4
neededpages = 4 + neededpages
signature = find_signature(pages)
end
end
print("ImposerMessage:: Original pages: " .. originalpages .. "; " ..
"Signature is " .. signature .. ", " ..
neededpages .. " pages are needed, " ..
pages .. " of output")
-- let's do it
tex.print("\\dorecurse{" .. neededpages .. "}{\\page[empty]}")
end
function find_signature(number)
assert(number ~= 0, "I can't find the signature for 0 pages")
assert((number % 4) == 0, "I suppose something is wrong, not a n*4")
local i = maxsignature
while i>0 do
if (number % i) == 0 then
return i
end
i = i - 4
end
end
</pre>
The ImposerMessage is important if you want to pass the output of the ConTeXt run to a script to do the imposing.
Then the master file
<texcode>
\def\fillthesignature#1{
\directlua{dofile("imposer.lua")
optimize_signature(#1)}}
\starttext
\dorecurse{53}{
\chapter{test}
\input tufte
\section{\the\realpageno}}
\page[yes] % reset the page
\fillthesignature{\the\realpageno}
And this is the last page (the backcover)
\stoptext
</texcode>
[[Category:Layout]]
