On Tue, 17 Apr 2007 22:02:51 +0200
Joao Moreira <joao.moreira@???> 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 ?
Owen
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