Comparison Of Different Scanning Methods

posted in Arts, Fine Arts Centers, Fine Arts Schools by Admin on January 20th, 2009

By jon crain

Scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Common examples found in offices are variations of the desktop (or flatbed) scanner where the document is placed on a glass window for scanning.

Another category of scanner is digital camera scanners, which are based on the concept of reprographic cameras. Due to increasing resolution and new features such as anti shake, digital cameras have become an attractive alternative to regular scanners.

There are lots more other varieties like drum, flatbed, film and hand scanners. Most scanners use charge coupled device and contact image sensor to sense image. New scanners are used to combine 3d objects with 2d objects on the screen by scanning 3d object and modeling that object with another.

Animation industry makes great use of this picture to create new 3d object just by scanning real 3d object into scanner. This saves valuable time required for other important steps in creation or building of any animation film or movie.

Due to increasing resolution and new features such as anti shake, digital cameras have become an attractive alternative to regular scanners. While still having disadvantages compared to traditional scanners, digital cameras offer advantages such as speed, portability, gentle digitizing of thick documents without damaging the book spine.

In drum scanner, photomultiplier tube is used which scans different positions of an image simultaneously. Drum scanner scans all image information with this PMT tube, rather than CCD array which is found in flatbed scanners.

Light from the original artwork is split into separate red, blue, and green beams in the optical bench of the scanner. Drum scanner is capable of scanning both reflective and transitive images. A good quality flatbed scanner has capability to produce high quality reflective artwork. Therefore, drum scanner are now rarely used to scan those high quality artwork.

Positive slides or negative film can be scanned through Film scanner which is dedicated for the same purpose. Usually, uncut film strips of up to six frames, or four mounted slides, are inserted in a carrier, which is moved by a stepper motor across a lens and CCD sensor inside the scanner.

Today, Scanner art has got great advantage in various fields. Scanner art is art made by placing objects on a flatbed scanner and scanning them. Because scanner uses little depth of field, it is matter of debate as to whether it is giving kind of digital photography or not.

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