How to set width for subfigures inside a table in a org-mode file?

Question

I'd like to use subfigures in org-mode files. In MS Word, this could be easily done by inserting the subfigures of a figure into a table with invisible borders. Then the size of each subfigure can be adjusted as you like.

Is there a way to use subfigures like this in Org-mode?

I tried to set size with e.g. #+ATTR_ORG: :width 400, and it only works on a single figure.

So, this works with the intended figure size:

#+CAPTION: Test Figure 
#+NAME: fig:test0
#+ATTR_ORG: :width 400
[[file:build/test.png]]

But when put into a table, the specified figure size (width) is ignored. (And the actual size of the sub-figure is used, which is way too large).

#+CAPTION: Test Figure 
#+NAME: fig:test
#+ATTR_ORG: :width 400
| [[file:build/test.png]] | [[file:build/test.png]] |

I have (setq org-image-actual-width nil) in my init.el. And this is under Emacs 26, Ubuntu 20.04, and Org mode version 9.3.7 (9.3.7-8-g3ed035-elpaplus). I am interested in exporting the org file to multiple targets including ODT. (So, I am looking for a generic solution.)

If the above usage is wrong, what is the correct usage to get properly sized subfigures?

-- Update --

This blog about extending org link syntax seems relevant. I guess I am looking for an extended way of specifying the image size as part of the link, with something like this:

[[file:build/test.png :width 300]]

as in

#+CAPTION: Test Figure 
#+NAME: fig:test
| [[file:build/test.png :width 300]] | [[file:build/test.png :width 300]] |

Is this doable in org?

Answer 1

If you can live without captions on subfigures this seem to work:

#+CAPTION: Two subfigures
#+NAME:   fig:twofigures
\begin{figure}
     \centering
     \begin{subfigure}
    \centering
        \includegraphics[width=0.47\textwidth]{image}
     \end{subfigure}
     \begin{subfigure}
    \centering
        \includegraphics[width=0.47\textwidth]{image}
     \end{subfigure}
\end{figure}

Reference to Figure [[fig:twofigures]].

Answer 2

In case this is still relevant at all, there is this post describing a possible implementation using a new link type.

I think a preferable implementation for latex would use the subcaption environment like...

(org-link-set-parameters
 "subfig"
 :follow (lambda (file) (find-file file))
 ;; :face '(:foreground "white" :weight bold :underline t)
 :display 'full
 :export
 (lambda (file desc backend)
   (when (eq backend 'latex)
     (if (string-match ">(\\(.+\\))" desc)
         (concat
          "\\subcaptionbox{" (replace-regexp-in-string "\s+>(.+)" "" desc) "}"
          "{\\includegraphics" "[" (match-string 1 desc) "]" "{" file "}}\n\\quad\n")
       (format "\\begin{subfigure}\\includegraphics{%s}\\end{subfigure}" desc file)))))

I am not sure about HTML. Also, this runs into issues if you have org-export-preserve-breaks t