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General:

The first drum scanners were developed by Hell since 1966. These
scanners were not linked to a computer, since pictures could not
yet be stored digitally. Available memory devices had not enough
memory capacity, and they were too expensive and too slow. Only
beginning in 1978, the first drum scanners could digitize pictures

and store them in a computer.

Principles of analog scanner     
 
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 A one hour lasting training course about scanner technology is available on DVD. Please consider about a donation and contact us by the contact form.

Here the first 4- minutes sample data.
       
  Chromagraph DC 300 B (1975)   Chromagraph DC 300 
       
  Tango / Primescan (1997)   Tango
       
  Topaz (1994)   Topaz
       
  NexScan 4200   Nexscan