home *** CD-ROM | disk | FTP | other *** search
/ NetNews Usenet Archive 1992 #19 / NN_1992_19.iso / spool / comp / graphics / 9342 < prev    next >
Encoding:
Internet Message Format  |  1992-09-01  |  1.1 KB
  1. Path: sparky!uunet!sun-barr!cs.utexas.edu!swrinde!network.ucsd.edu!munnari.oz.au!ariel!ucsvc.ucs.unimelb.edu.au!mits.com.au!alistair
  2. From: alistair@mits.com.au
  3. Newsgroups: comp.graphics
  4. Subject: Re: Image negative to positive algorithm
  5. Message-ID: <1992Sep1.093533.3554@mits.com.au>
  6. Date: 1 Sep 92 14:35:33 GMT
  7. References: <1992Aug28.143906.3553@mits.com.au>
  8. Lines: 24
  9.  
  10. In article <1992Aug28.143906.3553@mits.com.au>, 
  11. alistair@mits.com.au (me) writes:
  12. > Does anyone have an algorithm for producing positive images from
  13. > negatives.
  14. > 
  15. > I would like scan in a photo negative and view it (which is much
  16. > faster and cheaper than making test prints, given that the scanner is
  17. > already there).
  18.  
  19. I should have specified that I would like to convert colour negatives
  20. as well as B&W (grey-scale).
  21.  
  22. Grey-scale images may be converted using:
  23.  
  24.     <new pixel value> = <white pixel value> - <old pixel value>
  25.  
  26. My thanks to Wade Schuette and Clifton Liles for their help so far.
  27.  
  28. Thanks,
  29.  
  30. Alistair Grant
  31.  
  32. Internet:     alistair@mits.com.au
  33. Alternate:    alistair%mits.com.au@ucsvc.ucs.unimelb.edu.au
  34.