How do you convert a negative digital image to a positive?

When I scanned some of my slides they turned into negatives.  How can I get them back to positive images?

As I recently discovered, you actually can create a negative using Aperture , with the "Curves" controls.
Add a "Curves"-Brick from the "Adjustments"-drop down menu,
set the channel to RGB,
and invert the RGB curve by dragging the left handle upward and the right handle down.
This will invert the mapping of the luminance - black to white and white to black.
Cheers
Léonie
P.S. But thanks for pointing out my quartz filter action!

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