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[banner headline]"Am at a Loss!"[/banner headline]

It ALL STARTED as an idea for an Animated GIF transition, but I don't have very comprehensive GIF software, and so
I have NOT been able to GIFFer (or figger) it out

It is simply (the idea is simple, I mean)...
You look at an image and it transitions from a normal positive image to a negative one (and back if you want).
Now that was for the animated GIF, and I couldn't get it done

Next, I thought it might be easy to use Photoshop to do a SIMILAR effect but on ONE image and without animation.
The image changes from normal positive tones on one side to negative tones on the other (say L to R).

...
Some time later...
...

I still couldn't work it out (using CS2, but who knows about later versions?).

So I'm putting it out there: Does anybody know a way to do either, Animated GIF or single image?
Ta.
Am(a bit miffed)