I just took some photos negatives (memories from the pre-digital days
put them on my flat bed scanner. So now I have a color image of these
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,
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) ?
Joao Moreira de Sa Coutinho
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