How to invert colors, but not images?

Hi there,

I am a visual impaired person, and i found great to use accessibility option "invert colors" in OS X, but it is terrible to see my images inverted. How can I make an exception. Can someone try to write a little apple script for that.

Let me explaine: I want to use invert colors/high contrast, but I would like it not to invert images.

Thanks!