ask for an advice for org-display-inline-images

ask for an advice for org-display-inline-images

[numbchild]

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I hope somebody can provide an advice for `org-display-inline-images` to
set image background color.

Here is an link on StackExchange.Emacs:

http://emacs.stackexchange.com/questions/20574/default-inline-image-background-in-org-mode/20598?noredirect=1#comment32482_20598

I don't know how to write this advice.

I try the following code, but not work. (I'm not good at elisp)

```lisp
(defun create-image-with-background (file width background-color)
  (create-image file
                (and width 'imagemagick)
                nil
                :width width
                :background background-color))

(advice-add 'org-display-inline-images :filter-return
            (lambda (r)
              (create-image-with-background r)))
```

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