Re: SVG with embedded png

[Joe Corneli via "Emacs development discussions." <emacs-devel@gnu.org>]

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Joost Kremers writes:

> If I manually change the link to a relative one on my computer, Emacs (27.2)
> shows the linked png just fine (provided the png image is in the directory
> pointed to, of course). Why your Emacs isn't able to find the png, I don't know.
> Perhaps you moved it in between viewing the svg in Firefox and Emacs?

OP here, apologies: I neglected to make the link in my demo code easily
transferrable for testing!  I’ve streamlined the reproduction case.

Please try this:

$ emacs -Q demo.org

...where the org file is the one that’s attached, and the PNG file
Tft1st.png is saved in the /tmp directory:

$ ls -lt /tmp/Tft1st.png
-rw-rw-r-- 1 joe joe 391204 May 18 15:00 /tmp/Tft1st.png

Lastly, evaluate the Org block with C-c C-c.


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* Please evaluate the following block with C-c C-c
#+begin_src emacs-lisp :results output silent
(setq org-preview-latex-default-process 'dvisvgm) ;; works if it is dvipng
(setq org-preview-latex-process-alist
      '((dvipng :programs
                ("latex" "dvipng")
                :description "dvi > png" :message "you need to install the programs: latex and dvipng." :image-input-type "dvi" :image-output-type "png" :image-size-adjust
                (1.0 . 1.0)
                :latex-compiler
                ("latex -interaction nonstopmode -output-directory %o %f")
                :image-converter
                ("dvipng -D %D -T tight -o %O %f"))
        (dvisvgm :programs
                 ("latex" "dvisvgm")
                 :description "dvi > svg"
                 :message "you need to install the programs: latex and dvisvgm."
                 :image-input-type "dvi" :image-output-type "svg"
                 :image-size-adjust (1.7 . .1)
                 :latex-compiler
                 ("latex -interaction nonstopmode -output-directory %o %f")
                 :image-converter
                 ("dvisvgm %f -n -e -c %S -o %O"))
        (imagemagick :programs
                     ("latex" "convert")
                     :description "pdf > png" :message "you need to install the programs: latex and imagemagick." :image-input-type "pdf" :image-output-type "png" :image-size-adjust
                     (1.0 . 1.0)
                     :latex-compiler
                     ("pdflatex -interaction nonstopmode -output-directory %o %f")
                     :image-converter
                     ("convert -density %D -trim -antialias %f -quality 100 %O"))))
(org-toggle-inline-images)
(org-preview-latex-fragment '(16))
#+end_src

* Here is the file
[[file:/tmp/Tft1st.png]]

* Here it is from inside LaTeX, but that doesn't work properly

$$\mathit{Hello} \includegraphics[width=2cm,natwidth=445,natheight=661]{/tmp/Tft1st.png}$$


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I’ve attached a screenshot of what I see when I do this.  I noticed that

(setq org-preview-latex-default-process 'dvisvgm)

seems to be crucial for reproducing the problem.  If the variable is set
to use dvipng, then the picture does shows up as expected (but as inline
PNG format, not SVG).

(setq org-preview-latex-default-process 'dvipng)


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-- 
Dr Joseph A. Corneli (https://github.com/holtzermann17)

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