I've got a src block that has an image file as a result and I want that image file to be exported as a certain size.

I know I could apply the property #+ATTR_HTML: :width 100px, but I can't figure out a way to do that automatically when the result is produced.

The specific src block I'm using probably isn't necessary for an answer, but here it is anyway.

#+BEGIN_SRC python :noweb no-export :results file :exports both
image = cv2.imread("resources/examples/example-table.png", cv2.IMREAD_GRAYSCALE)
cell_images_rows = extract_cell_images_from_table(image)
cv2.imwrite("resources/examples/example-table-cell-1-1.png", cell_images_rows[1][1])


2 Answers 2


I've figured out something that works but isn't perfect.

#+NAME: html-image-size
#+BEGIN_SRC emacs-lisp :var text="" :var width="100%" :var height="100%" :results raw
(concat "#+ATTR_HTML: :width " width " :height " height "\n[[file:" text "]]")

Then I can set the :results of a src block to raw and add that emacs-lisp src block as a :post header arg.

#+BEGIN_SRC python :noweb-ref test-detect-table :noweb yes :results raw :post html-image-size(text=*this*, width="300px")
import cv2


image_filename = "resources/examples/example-page.png"
image = cv2.imread(image_filename, cv2.IMREAD_GRAYSCALE)
image = find_tables(image)[0]
cv2.imwrite("resources/examples/example-table.png", image)

That is almost perfect. The only thing I've noticed that I lose is org-babel-remove-result no longer works. It just removes the #+RESULTS: line while the file link remains.

Anyone know of a solution to that?

Edit: Found a solution.

There's no configurable option. There is a defconst regex that org-babel uses to find the start/end of result blocks. But I wrote a function to remove the #+ATTR.* lines that were causing the built-in regex to fail.

(defun remove-attributes-from-src-block-result (&rest args)
  (let ((location (org-babel-where-is-src-block-result))
        (attr-regexp "[     ]*#\\+ATTR.*$"))
    (when location
        (goto-char location)
        (when (looking-at (concat org-babel-result-regexp ".*$"))
          (while (looking-at attr-regexp)

(advice-add 'org-babel-remove-result :before #'remove-attributes-from-src-block-result)
(advice-add 'org-babel-execute-src-block :before #'remove-attributes-from-src-block-result)
  • Setting :results to raw causes the inability to remove the result automatically: there is no way for org-babel to figure out what is part of the result and what is not. So the only solution to that problem is to not use raw. I presume you are using the solution in your edit without :results raw?
    – NickD
    Apr 10, 2020 at 20:13
  • It's working fine, even with :results raw.
    – Eric Ihli
    Apr 10, 2020 at 20:50
  • Well, I find that hard to believe, although it might be working fine for your application. What happens if your output is more than one line? What happens if your output includes a line with #+ATTR.... in it?
    – NickD
    Apr 11, 2020 at 0:08
  • Look to org-babel-remove-result and org-babel-result-end. The advice-add I mention removes the ATTR lines. org-babel-remove-result and org-babel-result-end handle removing the actual result (regardless of how many lines), nothing I mention changes the org-babel-remove-result behavior.
    – Eric Ihli
    Dec 5, 2020 at 21:56
:wrap "org \n#+ATTR_HTML: :width 200"

seems to work:

#+begin_src mermaid :background-color transparent :wrap "org \n#+ATTR_HTML: :width 200" :file test..nogit..png
 A-->B: Works!

#+ATTR_HTML: :width 200

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