DPI stands for dots per inch or pixels per inch. DPI represents the resolution, accuracy, sharpness and clarity of your digital picture. A higher DPI is generally associated with a higher quality image; however, if the DPI exceeds the resolution of the original media, a higher DPI can actual diminish the quality of the image. Our default scanning is performed at 300 DPI for paper photos which is more than sufficient for using your digital photos electronically and also provides the ability to reprint any photo in the same size as its original. We provide an option to scan your paper photos with 600 DPI and with this higher resolution you can enlarge your image to a size twice as large as the original. Based on millions of scans, we find that the optimal DPI levels are: 300 - 600 DPI for paper photos depending on your expected use and 2000 - 4000 DPI for slides and negatives. Scanorb's service includes the following: high resolution scanning, Kodak Digital ICE (to remove dust and blemishes) and manual processing to crop, rotate and color correct your photos.