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After trying Hraban's two suggestions to resolve the problem of a 
caption ('title=') for an image across a two-page spread (and I have 
tried a variety of adaptations of those two possible solutions), I still 
have not resolved the issue.

To repeat what Hans gave me, to resolve the 2-page spread in the first 
instance:

\startpostponing
     \setuppagenumbering[state=stop]
     \startspread
         \startplacefigure[location=here,title={This is a cow!}]
         \externalfigure[cow.pdf][height=\textheight]%
         \stopplacefigure
     \stopspread
     \setuppagenumbering[state=start]
\stoppostponing

The problem I have is that the figure has a title/caption much longer 
than 'This is a cow', and the end result is that it commences on the 
verso page but then runs across (repeats, part of it) on the recto page. 
Hraban suggests, first of all:

title={\hbox to \textwidth{\vbox{Your lengthy caption}}}

but this results in the first part of the caption properly located 
left-flushed on the verso page, and the other part right-flushed (and to 
the right of the figure, so running off the page) on the recto page.

The second solution is

title={\framedtext[width=\textwidth,frame=off,align=right]{Your lengthy caption}}

and this almost works, but this time part of the caption repeats on the 
left  of the recto page more or less within the inner margin, so I can 
live with that, knowing that it will not be visible ultimately at the 
binding stage.

Of course, what I really want to achieve is that the caption (aka 
'title') appears either on the verso or the recto page, but not both. Is 
that achievable? The actual coding for all this as I have it at the 
moment is as follows:

\startpostponing
     \setuppagenumbering[state=stop]
     \startspread
         \startplacefigure[location=here,title={{\sc Plates 12/13.} 
\switchtobodyfont[9.5pt] My very, very,_very long\\ caption for this_ 
figure}]
         \externalfigure[plate12-13.jpg][height=.8\textheight]%
         \stopplacefigure
     \stopspread
     \setuppagenumbering[state=start]
\stoppostponing

but

..._very long caption_
_for this _...

is repeated on the recto page. This is what I want to avoid.
Julian

On 5/5/20 4:18 pm, Henning Hraban Ramm wrote:
>> Am 05.05.2020 um 03:31 schrieb jbf <roma83537@gmail.com>:
>>
>> The following excellent solution (see below) to a 2-page spread of an image was given me by Hans (I had been completely unaware of the command \startspread. It appears to be recent and undocumented, but it certainly simplifies matters).
>>
>> But in my case the title is a lengthy sentence, rather than the 4-word 'This is a cow'. And even though I have been able to split the line, e.g. title={this is my very, very, very,\\ very etc. etc. long title}, what happens is that part of the caption still appears on the right-hand page of the spread.
>>
>> Is there a way that I can limit the appearance of the caption to just one (the left-hand) page? In other words, so the figure is spread but not the caption? Or alternatively, have the caption neatly split across the two pages with appropriate space inbetween? I tried various combinations, including an \hfill halfway through the title, but to no avail. Perhaps this is asking too much, but there may be a workaround.
> I guess you need something like
>
> title={\hbox to \textwidth{\vbox{Your lengthy caption}}}
>
> or
>
> title={\framedtext[width=\textwidth,frame=off,align=right]{Your lengthy caption}}
>
>
> HTH
> Hraban
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p>After trying Hraban's two suggestions to resolve the problem of a
      caption ('title=') for an image across a two-page spread (and I
      have tried a variety of adaptations of those two possible
      solutions), I still have not resolved the issue.</p>
    <p>To repeat what Hans gave me, to resolve the 2-page spread in the
      first instance:</p>
    <p>\startpostponing
      <br>
          \setuppagenumbering[state=stop]
      <br>
          \startspread
      <br>
              \startplacefigure[location=here,title={This is a cow!}]
      <br>
              \externalfigure[cow.pdf][height=\textheight]%
      <br>
              \stopplacefigure
      <br>
          \stopspread
      <br>
          \setuppagenumbering[state=start]
      <br>
      \stoppostponing <br>
    </p>
    <p>The problem I have is that the figure has a title/caption much
      longer than 'This is a cow', and the end result is that it
      commences on the verso page but then runs across (repeats, part of
      it) on the recto page. Hraban suggests, first of all:</p>
    <pre class="moz-quote-pre" wrap="">title={\hbox to \textwidth{\vbox{Your lengthy caption}}}
</pre>
    <div class="moz-cite-prefix">but this results in the first part of
      the caption properly located left-flushed on the verso page, and
      the other part right-flushed (and to the right of the figure, so
      running off the page) on the recto page.</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">The second solution is</div>
    <div class="moz-cite-prefix">
      <pre class="moz-quote-pre" wrap="">title={\framedtext[width=\textwidth,frame=off,align=right]{Your lengthy caption}}</pre>
    </div>
    <div class="moz-cite-prefix">and this almost works, but this time
      part of the caption repeats on the left  of the recto page more or
      less within the inner margin, so I can live with that, knowing
      that it will not be visible ultimately at the binding stage.</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">Of course, what I really want to
      achieve is that the caption (aka 'title') appears either on the
      verso or the recto page, but not both. Is that achievable? The
      actual coding for all this as I have it at the moment is as
      follows:</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">\startpostponing<br>
          \setuppagenumbering[state=stop]<br>
          \startspread<br>
              \startplacefigure[location=here,title={{\sc Plates 12/13.}
      \switchtobodyfont[9.5pt] My very, very,<u> very long\\ caption for
        this</u> figure}]<br>
              \externalfigure[plate12-13.jpg][height=.8\textheight]%<br>
              \stopplacefigure<br>
          \stopspread<br>
          \setuppagenumbering[state=start]<br>
      \stoppostponing</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">but</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix"> ...<u>very long caption</u></div>
    <div class="moz-cite-prefix"><u> for this </u>...<br>
    </div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">is repeated on the recto page. This is
      what I want to avoid.</div>
    <div class="moz-cite-prefix">Julian</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">On 5/5/20 4:18 pm, Henning Hraban Ramm
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:8CB4DA67-6F85-4CBC-A1C0-B1FF9138A670@fiee.net">
      <pre class="moz-quote-pre" wrap="">
</pre>
      <blockquote type="cite">
        <pre class="moz-quote-pre" wrap="">Am 05.05.2020 um 03:31 schrieb jbf <a class="moz-txt-link-rfc2396E" href="mailto:roma83537@gmail.com">&lt;roma83537@gmail.com&gt;</a>:

The following excellent solution (see below) to a 2-page spread of an image was given me by Hans (I had been completely unaware of the command \startspread. It appears to be recent and undocumented, but it certainly simplifies matters).

But in my case the title is a lengthy sentence, rather than the 4-word 'This is a cow'. And even though I have been able to split the line, e.g. title={this is my very, very, very,\\ very etc. etc. long title}, what happens is that part of the caption still appears on the right-hand page of the spread.

Is there a way that I can limit the appearance of the caption to just one (the left-hand) page? In other words, so the figure is spread but not the caption? Or alternatively, have the caption neatly split across the two pages with appropriate space inbetween? I tried various combinations, including an \hfill halfway through the title, but to no avail. Perhaps this is asking too much, but there may be a workaround.
</pre>
      </blockquote>
      <pre class="moz-quote-pre" wrap="">
I guess you need something like

title={\hbox to \textwidth{\vbox{Your lengthy caption}}}

or

title={\framedtext[width=\textwidth,frame=off,align=right]{Your lengthy caption}}


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

maillist : <a class="moz-txt-link-abbreviated" href="mailto:ntg-context@ntg.nl">ntg-context@ntg.nl</a> / <a class="moz-txt-link-freetext" href="http://www.ntg.nl/mailman/listinfo/ntg-context">http://www.ntg.nl/mailman/listinfo/ntg-context</a>
webpage  : <a class="moz-txt-link-freetext" href="http://www.pragma-ade.nl">http://www.pragma-ade.nl</a> / <a class="moz-txt-link-freetext" href="http://context.aanhet.net">http://context.aanhet.net</a>
archive  : <a class="moz-txt-link-freetext" href="https://bitbucket.org/phg/context-mirror/commits/">https://bitbucket.org/phg/context-mirror/commits/</a>
wiki     : <a class="moz-txt-link-freetext" href="http://contextgarden.net">http://contextgarden.net</a>
___________________________________________________________________________________
</pre>
    </blockquote>
  </body>
</html>

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