Hi,

Here is a patch. Sorry for the bug!

Abdó.

Eric Schulte <eric.schu...@gmx.com> writes:

>> Seems to be caused by 149cc04782651e74764eb3188f6a6f178fe25f64, which is
>> unfortunate since that fixes (at least I *think* it fixes) some problems
>> when no default fore/background is defined (e.g. when emacs is run in
>> batch mode). It would be nice if this could be fixed without reverting
>> that commit completely.
>
> I'm CC'ing Abdó (the author of that commit).  Hopefully he can take a
> shot at solving this.
>
> -- 
> Eric Schulte
> http://cs.unm.edu/~eschulte

>From a48efe084848aa1de8ad4abc5780d49b424a3980 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Abd=C3=B3=20Roig-Maranges?= <abdo.r...@gmail.com>
Date: Thu, 13 Sep 2012 20:13:37 +0200
Subject: [PATCH] fix dvipng latex export with Transparent background

* org.el (org-create-formula-image-with-dvipng): Fixes a bug
introduced in 149cc04782651e74764eb3188f6a6f178fe25f64 that made it
fail with no :foreground and :background attributes set, due to bad
handling of "Transparent" color.
---
 lisp/org.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/org.el b/lisp/org.el
index 881dbd5..1c18d70 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -17612,9 +17612,9 @@ share a good deal of logic."
 	 (bg (or (plist-get options (if buffer :background :html-background))
 		 "Transparent")))
     (if (eq fg 'default) (setq fg (org-dvipng-color :foreground))
-      (setq fg (org-dvipng-color-format fg)))
+      (unless (string= fg "Transparent") (setq fg (org-dvipng-color-format fg))))
     (if (eq bg 'default) (setq bg (org-dvipng-color :background))
-      (setq bg (org-dvipng-color-format bg)))
+      (unless (string= bg "Transparent") (setq bg (org-dvipng-color-format bg))))
     (with-temp-file texfile
       (insert (org-splice-latex-header
 	       org-format-latex-header
-- 
1.7.12

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