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Still-Digital  Cameras
Computer  Configurations

Photography (Advanced) - Advanced manual for photography and other graphic techniques
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The Kodak DCS 200 is a modified Nikon 8008 equipped with a Kodak DCS 200 camera back (fig. 3-6). The DCS 200 is capable of 1.54 million pixels of resolution. It also has an internal hard drive that can store up to 50 images. A small "hitchhiker" 40Mb hard 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. The advantages of the Kodak DCS 200 over the Kodak DCS are higher resolution and portability. It is more portable than the DCS because it has a built-in 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. One of the biggest advantages of capturing an image digitally is the way the images can be processed. 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. FIgure  3-6.—Kodak  DCS  200. Scanners Film transparencies, negatives, and prints are sources of images that can be produced and edited electronically.  Scanners  can  create  digitized  images with extremely high resolution. Scanners are also capable of providing resolution equal to the original negative  or  print. Scanners come in three categories: rotary drum, flatbed, and film. Rotary-drum scanners provide the 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. Scanners that use charge-coupled devices (CCDs) provide  excellent  quality.  They  are  used  in  many  Navy 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. Full-color scanners have three rows of CCDs: one for red, one for green, and one for blue. This tricolor 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 desktop scanners operate in the 300- to 400-dpi range. When an image is scanned on a scanner that produces 1,000 to 5,000 dpi, a higher resolution results, but the scan time and file size also increase. Generally, the resolution required for a scanned image is limited to the output of the imaging system. A flatbed scanner is used for scanning photographs and artwork. Some flatbed scanners are also capable of scanning transparencies and color negatives. The resolution of flatbed scanners range from 200 to 1,200 dpi. Unlike a rotary-drum scanner, a flatbed scanner scans an entire line at one time with a linear CCD array. Film scanners are used to scan negatives and transparencies. Many of these scanners come with software packages that allow you to crop the image and 3-10







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