Looking for a free picture viewing program that will allow me to invert the color of pictures to the exact oppsite color

Looking for a free picture viewing program that will allow me to invert the color of pictures to the exact opposite color.

Or, better yet, are there any programs available that will allow me to specify exactly how much of an inversion to perform by specifying a percentage value?

I need this kind of software so that I can closely analyze, compare, and contrast photos to discover differences and similarities that might otherwise be impossible or extremely hard to detect by the normal human eye by viewing the picture in its original format.
IT GuyNetwork EngineerAsked:
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WillThomasonCommented:
MS Paint will do this, or at least your first requirement. Select the area you want to invert (or all of it), right click on the area and do "invert color". Those are the windows 7 instructions, not sure about XP.
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Brian GeeCommented:
Irfanview also inverts colors (go to Image > Negative) along with a bunch of other edit options as well.

http://www.irfanview.com/
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Paul SauvéRetiredCommented:
Hi Knowledgeable,

Paint.NET (download here) will also accomplish this. And it is free!

PaulS
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smartchapsCommented:
Picasa is a good program for photo viewing and editing. It has many advanced and useful features and its totally free. Just Google Picasa and install it. I think u will love it & will help u a lot.
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Paul SauvéRetiredCommented:
Yes but, Picasa cannot invert the color of pictures!
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