I have scanned some film negatives (35mm) and have run into the classic orange color problem. Using the Gimp, simply inverting the color of the image (Colors->Invert) leads to a very discolored image that is quite different from the original developed copy.
Unfortunately, the scanner I am using doesn't provide any automatic correction and I'm stuck doing it myself. How would I go about correcting such an image - keeping in mind that I do not have access to the camera that the pictures were taken with? Is there a tool (preferrably free) that can perform this correction automatically? Are there standard parameters I can use?