Here is another method a friend just gave me.
You will need a digital camera with a Macro/Magnifying Glass setting, and preferably with at least a 6 Megapixel resolution. Also, a light table is best to illuminate the transparency.
Place the transparency on the light table, and, using the Macro setting, carefully frame the image and photograph it.
If a reflection of your camera appears on the image, get a black framing card with an opening the size of the image on the transparency. The framing card is generally available at photo supply stores. Place the framing card over the transparency and the camera's reflection will disappear.
Continue this process for all of your transparencies, and transfer the images from your camera to your computer. Now, using photo manipulation software such as Photoshop, you can color correct, crop, rotate, and adjust the images as you wish. It's a good idea to label each photo for categorization and archiving and save them as .jpg files. As .jpg images they will take up less memory to store plus the .jpg standard will be with us for a long time.