On Tue, 17 Apr 2007 22:02:51 +0200
Joao Moreira <[EMAIL PROTECTED]> wrote:

> Hi,
> I just took some photos negatives (memories from the pre-digital days 
> :-) and
> put them on my flat bed scanner. So now I have a color image of these 
> negatives
> in the gimp, so how do I go about turning them into a positive ?
> I would expect this to be a very simple operation, like a subtraction, 
> on each
> pixel, right ? does this exist ? is there a tool/filter that does this ?
> Or do I need to code a plugin, and if so, what exactly is the operation 
> to be done
> (in terms of RGB) ?

Image->Layers->Colors->Invert ?

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