Many thanks Ivan. In reading the log file in /tmp I understood the problem
that is not an org-mode issue, but a latex one: some parts needed '$$'
tags.
Anyway, thanks for your reply.

Best wishes,

Jo.

Le mer. 22 mai 2019 à 21:46, Ivan Tadeu Ferreira Antunes Filho <
ivanaf@mit.edu> a écrit :

> I was having the same problem on some latex previews. It seems that
> imagemagick expects the file to be in the /tmp/ directory while latex
> itself was putting the file in the same directory.
>
> My workaround was to use 'dvisvgm instead of 'imagemagick.
>
> (setq org-preview-latex-default-process 'dvisvgm)
>
> And when generating latex from a source block, to save the image as svg
> instead of png.
>
> I think the same can be done for org-latex-create-formula-image-program
>
> Not a solution, just a simple workaround.
>
> On Wed, May 22, 2019, 15:39 Joseph Vidal-Rosset <
> joseph.vidal.rosset@gmail.com> wrote:
>
>> Hello the list,
>>
>> I try desperately to export an org file to html with imagemagick option
>> (an not mathjax), and I have this error message:
>>
>> convert-im6.q16: no images defined `/tmp/orgtexlyqPro.png' @
>>> error/convert.c/ConvertImageCommand/3258.
>>> org-compile-file: File "/tmp/orgtexlyqPro.png" wasn’t produced.  Please
>>> adjust ‘imagemagick’ part of ‘org-preview-latex-process-alist’.
>>>
>>
>> I have in my user.el  (= init file)  :
>>
>> (setq org-latex-create-formula-image-program 'imagemagick)
>>
>> Any help is welcome,
>>
>> Best wishes,
>>
>> Jo.
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>