With Grain2Pixel, all Adobe Photoshop users get a free plugin for converting previously digitized colour negatives. I have tried out this little tool and am publishing a step-by-step guide here. It actually worked pretty well for me.
Using a special film scanner or a compatible flatbed scanner, it is relatively easy to digitize photographic film (negatives and slides). In this article, the procedure with such a device is roughly demonstrated and there are some tips for better results.
Here is a list of programs that can be used to convert digitized negatives into positives. These programs are specifically designed to process digitized color negatives and render images with natural colors and tones—whether they were scanned or created using 'camera scanning'.