A high quality, high priced device which uses photomultiplier tubes to translate an image from analog to digital. Drum scanners are much larger than desktop scanners and give the operator much more control over image manipulation while scanning. Images are mounted on a round cylinder, or drum, for scanning. A scanner passes a moving beam of light over an image and receives data about the color or value of each spot in the image. These spots are assigned values from 0-256 so that computers can display them.
A type of scanner in which a map, diagram or photograph is placed on a cylinder which rotates slowly while a scanning beam quickly moves back and forth parallel to the revolving image. At the same time, the "x,y" coordinates and spectral signature of each element of the image are recorded. (See Scanner).
A type of SCANNER in which the original to be scanned is wrapped around a glass cylinder and spun at high speed, while a light-sensing device called a PHOTOMULTIPLIER TUBE scans across the cylinder. Drum scanners offer much higher resolution, greater tonal reproduction, higher DYNAMIC RANGE, and greater control over the scanned image than FLATBED SCANNERS do, and allow the image to be COLOR CORRECTED as the scan is being made. Most drum scanners also allow scanning of very large originals. However, drum scanners are very expensive (ranging in price from tens of thousands of dollars to a quarter-million dollars or more) and require a high degree of technical expertise to operate.
High resolution scanner able to digitize reflective or transparent images.
The best (and most expensive) scanner, used for both scanning and conventional separations where the image is mounted to a transparent drum. After the art is loaded into the scanner, the drum is rotated at a high speed to capture the image data.
A high-quality image-capture device. The image to be captured is wrapped around a drum that spins very fast while a light source scans across it to capture a digital version of the image.
a very, extremely, horribly expensive type of scanner
An extremely high resolution and pre-press scanner quality, that uses a high-speed rotating glass drum to scan transparencies and photographic images. Drum scanners give a much more detailed reproduction of an original than flat-bed desktop scanners and can capture a much greater range of tones. However, the gap between some of the top flatbed scanners and drum scanners is narrowing at a dramatic rate.
Early drum scanners separated scans into CMYK data, recording these directly onto film held on a second rotating drum.
A scanner that functions by mounting the original on a rotating cylinder, through or onto which a point-light is then transmitted. The scanning unit moves parallel to the cylinderâ€(tm)s axis of rotation, directing the light of the original via optical and color filters towards photo-multipliers. As photo multipliers only give analog signals, an electronic unit is required to convert them into digital signals.
Scanner where color prints or transparencies are mounted to a rotation drum. A the drum spins, light from the image enters a lens, where it is recorded by one or more photomultiplier tubes (PMT tubes). Usually records more digital information than the CCD device, allowing for better image manipulation and printing detail.
Rumpuskanneri Trumscanner Scanner with cylindrical platen for mounting transparencies to be scanned
A type of optical scanner where the reflective or transmissive art is mounted to a rotating drum. As the drum spins, light from the image enters a lens allowing the image to be recorded in a series of fine lines.