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copied!<p>A poor man's solution that works with advices and hooks is shown below. Paste the code into your .emacs configuration file and re-start emacs. Afterwards, the equation images should be scaled <del>at</del> <em>along with the text if you press</em> C-+/-/0. <em>They are just previews and their</em> <del>The bad thing is that the</del> resolution is not enlarged. To get equation images with a good resolution hit C-c C-x C-l to regenerate the images. <em>Note, that this sets the :scale property of the customization variable org-format-latex-options. The customization of this variable will be lost for the current emacs session.</em></p> <p>You need a gnu-emacs with built-in imagemagick. Should be standard by now.</p> <pre><code>(defvar text-scale-mode-hook nil "Hook run at end of command `text-scale-mode'.") (defadvice text-scale-mode (after text-scale-mode-hooks nil activate) "Run `text-scale-mode-hook' at end of command `text-scale-mode'." (if (functionp text-scale-mode-hook) (funcall text-scale-mode-hook) (loop for hook in text-scale-mode-hook do (if (eq hook 't) (run-hooks (default-value text-scale-mode-hook)) (run-hooks hook))))) (defun org-text-scale-eye () "Scale equation images according to text-scale-mode-amount." (when (boundp 'text-scale-mode-amount) (let ((relwidth (* (expt text-scale-mode-step text-scale-mode-amount)))) (loop for ol in (overlays-in (point-min) (point-max)) do (when (eq (overlay-get ol 'org-overlay-type) 'org-latex-overlay) (unless (overlay-get ol 'org-image-original-width) (overlay-put ol 'org-image-original-width (car (image-size (overlay-get ol 'display) t)))) (let ((ol-disp-plist (cdr (overlay-get ol 'display)))) (setq ol-disp-plist (plist-put ol-disp-plist :type 'imagemagick)) (setq ol-disp-plist (plist-put ol-disp-plist :width (round (* relwidth (overlay-get ol 'org-image-original-width))))) (overlay-put ol 'display (append '(image) ol-disp-plist)) )))) (force-window-update) )) (add-hook 'org-mode-hook '(lambda () (add-hook 'text-scale-mode-hook 'org-text-scale-eye))) (defadvice org-format-latex (before set-scale activate) "Set :scale in `org-format-latex-options' to the scaling factor resulting from `text-scale-mode' and clear cache." (let ((relwidth (expt text-scale-mode-step text-scale-mode-amount))) (unless (= (plist-get org-format-latex-options :scale) relwidth) (plist-put org-format-latex-options :scale relwidth)))) </code></pre> <p>Actually, I had a look at the code in org.el: The font height is regarded in the function org-create-formula-image-with-dvipng and the resolution option -D is set. Maybe, there goes something wrong. Furthermore, pityingly, in org-format-latex the images are cached and not reproduced after font size changes.</p> <p>If you want to increase the size of the latex-formulas for one session in general with good quality you can set the :scale value of the customization option "Org Format Latex Options" in the group "org-latex" to a higher value.</p> <p><em>Edit 2013-10-10 (marked as italic throughout the answer except the code, naturally): The :scale property of the option org-format-latex-options is now set automagically. Therefore, the above hack should be quite usable (such as the latex version mentioned below).</em></p> <hr> <p>The same problem as you describe in the original-post exists for latex-preview. But, for that case there is a better solution:</p> <pre><code>(require 'face-remap) (defadvice preview-inherited-face-attribute (after preview-inherit-local-face nil activate) "Scale preview images with respect to buffer-local face" (when (and text-scale-mode (eq attribute :height)) (setq ad-return-value (* (expt text-scale-mode-step text-scale-mode-amount) ad-return-value)))) </code></pre> <p>After C-+/-/0 type C-c C-p C-d to re-generate all formulas of the document. Afterwards, the formulas have just the right size and the right resolution.</p> <p>If switching to latex documents with preview is an option for you I would recommend it. I use org only for notes and time-tables with easy links.</p> <p>For more descriptive documents I use latex documents with auctex/preview. But, I actually compile them only very seldom to a final pdf document. The preview is good enough. See the following Figure. <img src="https://i.stack.imgur.com/7RihX.png" alt="enter image description here"></p>

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