Inversion

The Sunday Challenge = Inversion
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Make positive what was negative.
I like the concept and I started to play with the idea.

With IrfanView I managed to invert blue and green channels only, but not the red channel. Then convert to greyscale and adjust contrast.
Now both of the red and white road signs catch the eye, they really represent negative and positive.
But I doubt if negative became positive.......
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