Would something like this work?
\setupbackgrounds[page][
background={BookIllustrationLayer},
]
\definelayer[BookIllustrationLayer][
width=\paperwidth,
height=.5\paperheight,
y=.5\paperheight,
position=no,
repeat=no,
]
\setlayer[BookIllustrationLayer]{%
\clip[x=\doifelseoddpage{2}{1}]{%
\externalfigure[filename][
width=2\paperwidth,
height=.5\paperheight]%
}%
}%
On Wed, Apr 29, 2020 at 5:05 PM jbf <roma83...@gmail.com> wrote:
>
> Hi list,
>
> With 99% of work complete on a book, including single page images, I now find
> myself confronted with a final problem: how to run one image across facing
> pages or in other words, one image (plus its caption) across a two-page
> spread, such that there is no gap.
>
> I have tried a number of fairly crass attempts (obviously too simple) to see
> if I could get somewhere near what I want, e.g.
>
> \externalfigure[plate12.jpg][width=\paperwidth, height=.7\paperheight,
> frame=none] {\tfx \sc Plates 12, 13. \tfx Twenty trucks from the Netherlands
> setting off}
>
> \externalfigure[plate13.jpg][width=\paperwidth, height=.7\paperheight,
> frame=none] {\tfx for their first mission amongst the German diaspora.}
>
> My thinking here was that \paperwidth might help extend the image to the
> inner edge on the left-hand page, but it doesn't work that way for the
> right-hand page, since there it extends to the outer edge, not the inner
> edge! The .7\paperheight was to provide room for the caption. But all in all,
> this is no solution!
>
> If it is any help, the setup dimensions for the book are US Digest:
>
> \definepapersize
> [ACN][width=5.5in,height=8.5in] % w140mm x h216mm
>
> I then looked up how one might do it in LaTeX, and found the following link:
> https://tex.stackexchange.com/questions/23860/how-to-include-a-picture-over-two-pages-left-part-on-left-side-right-on-right
>
> How much of that would be transferable to ConTeXt? (I am thinking
> particularly of the \newcommand*{\twopagepicture}[4] bit.
>
> There are explanations for how to do this in InDesign, and since it is
> something someone might often want to do (e.g. in magazines), I also thought
> it might be easier to find reference to it on Contextgarden, yet haven't
> found anything there. But I am sure ConTeXt has a way to do this.
>
> Could someone point me in the right direction with this please?
>
> Julian
>
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
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