How do I invert an image on the IMAC, then print it out?

I am trying to take a color picture on black background, invert it to white background, then to black and white to conserve black ink on my printer. I have found no software on the IMac that will allow me to do that. Thought going to Universal Preferences, switching backgrounds and then to B&W, then grabbing the screen image would do it but it still prints out in the original color scheme. Any suggestions?

If you are comfortable with Photoshop technique try GIMP which is a very powerful image editor, open source, which = free. You are not inverting it you need to select the black area and change it to white.
Seems like a huge amount of work vs. the ink cost.

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How do I invert an image on the IMAC, then print it out?

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