To reproduce with `emacs -Q` :
- Open an org buffer
- Call ~(setq org-format-latex-options '(:foreground default
:background "Black" :matchers ("$")))~
- Call =C-c C-x C-l= (org-latex-preview) on a latex fragment such as
$abc$
This bug was introduced by the commit 2f9e1569f which adds the option
`-bg Transparent` to the arguments of `dvipng`. According to its
manual, this option should be ignored if a background is already set,
but it doesn't seem to be. Perhaps org should set it differently.
--
Sébastien Miquel
