dark images on a dark bad

[jidanni@xxxxxxxxxxx]

Using
$ cat .Xresources
Emacs*Background: DarkSlateGray
Emacs*Foreground: Wheat

Browsing http://en.wikipedia.org/wiki/Earthing_system is difficult, as
the images end up being dark lines on dark background. One needs to
use emacs --reverse-video to see them.

There should be a command that can add a white etc. background to all
images on the page, or some other remedy.