| ADF | Automatic Document Feeder. This device, attached to the scanner, frees the operator
from positioning each page on the scanner. |
| CD | Compact Disk. Each disk holds about 600 to 700 MegaBytes of information. |
| Compression | The process whereby the raw image is represented with fewer bytes. Both Lossy and Lossless compression schemes are available. |
| Double-Letter sized | Page size that is 11" x 17". |
| DPI | Dots per inch. See Resolution. |
| Duplex | Refers to scanners which scan both sides of a page on a pass through the scanner. |
| ICR | Intelligent Character Recognition. Same as OCR but implies information other than the
pixels in the image can be used to increase accuracy. |
| IPM | Images per minute. Refers to the number of images the scanner can produce from a double-sided page. |
| Legal sized | Page size that is 8.5" x 14". |
| Letter sized | Page size that is 8.5" x 11". |
| Lossless | No information is lost compressing a raw image file. CCITT4 is one lossless compression scheme. |
| Lossy | Some information from the raw image is lost in an effort to minimize file size. JPEG is one lossy compression scheme. |
| OCR | Optical Character Recognition. This is the process whereby the image is converted to text and can be edited. Also, see ICR |
| PDF | Portable Document Format. Developed by Adobe to by system independant. |
| Pixel | Also PEL, picture element. The smallest unit of information in an image |
| PPM | Pages per minute. Refers to the number of physical pages the scanner can process in a minute. |
| Resolution | Number of pixels for each inch on the original page. The higher the value, the more detail and the smoother the edges in the image. |
| Scanner | Device used to create a digital representation of information on page of paper |
| SCSI | Small Computer Systems Interface. A card inserted into motherboard of computer to communicate with scanner or other devices. |
| Simplex | Refers to scanners which scan only one side of a page on a pass through the scanner. |
