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Digital-Image File Storage
Editing Digital Images

Photography (Advanced) - Advanced manual for photography and other graphic techniques
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transfer,  and  printers  that  use  silver-halide  photographic paper to produce digital images. Color copiers can also be used to print digital images to provide suitable quality at high speed and relatively low cost. Like most electronic  equipment,  a  large  variety  of  printers  are available on the market. They range from hundreds to thousands of dollars. Most printers used for making color prints from digital images use three colors: cyan, yellow, and magenta (CYM). Some printers match the full cyan, yellow,  magenta,  and  black  (CY  MK)  process. Located between the printer and the computer is a RASTER IMAGE PROCESSOR (RIP) or a PAGE DESCRIPTION   LANGUAGE   (PDL).   This   is   a software and hardware configuration that permits information to flow to the printer so the printer knows where to place the image on the paper. Thermal-Dye  Transfer  Printers Thermal-dye transfer printers are often called dye- sublimation or dye-diffusion thermal-transfer printers. This   system   provides   high   quality   and   an environmentally safe method of transferring images to print   and   transparency   materials   without   using chemicals (fig. 3-10). The thermal-dye transfer printing process uses thousands of tiny heating elements that come in contact with  "donor  ribbons."  Each  donor  ribbon  releases  a gaseous color dye when heated. Three-color printers have cyan, magenta, and yellow ribbons (CMY); four-color printers also include a separate black ribbon (CMYK). The amount of heat from each element Figure 3-10.—Kodak 7720 thermal-dye transfer printer. controls the amount of dye being transferred to the print material. The blend of the gaseous colors creates a continuous-tone   image. The   quality   of   a   thermal-dye   transfer   print resembles  a  print  made  from  conventional  silver-halide paper. The resolution of thermal-dye transfer printers ranges from 160 to 300 dpi. Resolution is limited by the  thermal  printing  head.  Thermal-dye  transfer printers can produce prints from 3.5 by 5 inches up to 14 by 17 inches. Inkjet  Printers Inkjet printers are used in a variety of situations from  newsprint  to  transparency  materials.  Inkjet printers use cyan, magenta, yellow, or black streams of ink to produce images. Inkjet printers today are capable of producing excellent continuous-tone color prints by using  variable-size  dots  of  ink  that  are  precisely controlled. Inkjet printers are nonimpact printers that use droplets of ink. As the head of the printer moves across the surface of the paper, it shoots a stream of tiny electrostatically charged ink drops at the paper. Color Copiers Color copiers were originally designed strictly for copying  color  originals.  Today,  however,  color  copiers have the added capability of copying transparencies and being connected directly to imaging workstations through an interface. This interface accepts digital signals  to  produce  color  photographs. Color copiers are capable of producing prints with a true photographic appearance. One minor drawback to prints produced on color copiers is they are printed on plain, bond paper stock Color copiers use a laser device that fuses toner to paper to create the image. Some color copiers, such as the Canon Color Laser Copier 500 (fig. 3-11), can be used as a flatbed scanner in addition to providing high-quality color images directly from computer files. The resolution of such color copiers is 400 dpi on standard copier paper. Thermal-Wax  Transfer  Printers Thermal-wax transfer printers operate on the same principle   as   thermal-dye   transfer   printers. Thermal-wax transfer printers use cyan, magenta, and yellow wax type of pigments instead of ink to produce images. 3-14







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