You will need to connect a scanner to your computer, typically using a USB port and using appropriate software, the scanned picture will be stored as a JPEG image (. jpg file).
Well to do this obviously you need to by a scanner. This works like a copier only it produce a digital image on your computer. Then you can do what ever you want with it.
First of all, you need a scanner. Then you can either select your scanner's software and follow the instructions, or select a button on your scanner and it will work.