The physical resolution at which a device can capture an image. The term is used most frequently in reference to optical scanners and digital cameras. In contrast, the interpolated resolution indicates the resolution that the device can yield through interpolation — the process of generating intermediate values based on known values. For example, most scanners offer an optical resolution of 300 dpi, but an interpolated resolution of up to 4,800 dpi. This means that the scanner can actually capture 90,000 pixels per square inch. Then, based on the values of these pixels, it can add 15 additional pixels in-between each pair of known values to yield a higher resolution.
- Optical Scanner
A device that can read text or illustrations printed on paper and translate the information into a form the computer can use. A scanner works by digitizing an image — dividing it into a grid of boxes and representing each box with either a zero or a one, depending on whether the box is filled […]
- optical viewfinder
On a digital camera optical viewfinder is the eyepiece that you look through to frame and focus your subject before taking the picture. Because the optical viewfinder and your camera lens are not positioned the same way (e.g. the viewfinder is located above the camera lens), you may notice your final image is not an […]
- optical zoom
On a digital camera, optical zoom is a true zoom feature. It allows you to zoom in (or out) on the subject in the LCD or viewfinder. This will enable you to get a closer view of the subject before taking your picture. Optical zoom changes the magnification of images with the actual optical glass […]
(1) In programming, to fine-tune a program so that it runs more quickly or takes up less space. (2) When applied to disks, the term means the same as defragment. See under fragmentation. (3) To configure a device or application so that it performs better.
(1) In command-driven interfaces, an option is an addition to a command that changes or refines the command in a specified manner. As the term implies, options are just that — they are not required. In the DOS operating system, options are preceded by a slash (/). For example the DIR command supports the /P […]