Scanner Resolution
It Determines the ability to capture detail from the original.
- Sampling resolution is determined by the size of CCD elements or scanner beam, size of stepping increment, focusing accuracy and mechanical precision.
- The limit of a scanners’s resolution is determined by its design and is referred to as the optical resolution.
- For drum scanners the resolution is determined by the speed of the analyze head in one direction and the diameter of the drum and the way data are digitized in the other.
- In flatbed scanners, resolution is controlled by software, with unwanted information being discarded for lower than optical resolution.
- Thus it is important to carefully chose the scanning resolution depending on the desired output device.
- Line art should be scanned at the highest optical resolution of the device (not the highest addressable resolution since that is interpolated and therefore may lead to artificial features on thin lines).