Digital Photography offers all the flexibility of the traditional darkroom and much more. Actually now one of the main issues is finding the software that fits your level of interest.
Certainly the many versions of Photoshop offer versions for professionals to knowledgeable amateur. (use the back button on your browser to return to this site) Photoshop tools allow you to manipulate images in a variety of ways. Here is a simple repairto an old print.
Another source of software is from Google and provides the basic tools to adjust image color, density, redeye, sharpen and crop. Perhaps more significantly, Picasa is relatively simple but robust image management tools that make the sharing of images easy. Snapfish and Yahoo also offer straight forward ways to share images via the net.
Many other image management and manipulation programs may be purchased or downloaded. You are likely to already have one on your computer. "Microsoft Office Picture Manager and "Microsoft Picture It are examples.