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The DCS 200 is capable of 1.54 million pixels of resolution. It also has an internal hard drive that can drive is also available. This 40Mb hard drive plugs directly into a small computer system interface (SCSI) port on the camera for additional image storage. The SCSI is pronounced SCUH-zee. hard drive. The disadvantages of the DCS 200 are it stores less images than the DCS 100, and it has no built-in compression or transmission capabilities. A digital image may be re-recorded without loss of image quality and the color and sharpness can be enhanced. This digital signal is identical to the signal used in a computer; thus, by using the proper interface, the signal from a digital-still camera can be imported directly into a computer. electronically. Scanners can create digitized images with extremely high resolution. Scanners are also capable of providing resolution equal to the original negative or print. highest quality for converting images from film or prints, but they are very expensive. Rotary-drum scanners are capable of producing resolution ranging from 1,000 to 5,000 dpi. When a rotary-drum scanner is used, the film or photograph is placed on the surface of a drum that rotates while the original is scanned by a single beam of light. The beam of light and the speed of the drum can be adjusted to control the amount of resolution desired. imaging facilities. Scanners operate similar to a photocopy machine. A CCD chip with a row of light receptors scans a photograph or negative and changes the colors or shades of gray (analog signal) into digital values. array permits full-color scanning with a single pass of the scanning head. The number of elements in the CCD array determines the resolution of the images being scanned. For example, an 8.5-inch linear array with 2,540 elements has approximately 300 elements per inch. This array can produce a digitized image with a resolution of 300 dots per inch (dpi). Most standard When an image is scanned on a scanner that produces resolution required for a scanned image is limited to the output of the imaging system. scanning transparencies and color negatives. The dpi. Unlike a rotary-drum scanner, a flatbed scanner scans an entire line at one time with a linear CCD array. software packages that allow you to crop the image and Advanced Photography Course |
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