# Re: Which scanners REALLY provide 36 bit output? HP?

From: Marko Cebokli (s57uuu@hamradio.si)
Date: Tue Dec 12 2000 - 08:29:49 PST

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  Bob Washburne wrote:
  >
  > Stephen Williams wrote:
  > >
  > > Imagine if hearing could be similarly tricked using only three pitches:-)
  > >
  >
  > I think it already has been.
  >
  > There was a game (Barbie ?) for the old Commodoore 64 in which Ken calls
  > Barbie up for a date and she has to go shopping for a new outfit.
  > Anyway, Ken and Barbie both had nice digitised voices. Beachhead II
  > also had good voice digitization.
  >
  > But the only sound available for the C64 was a simple synthesizer which
  > produced square, triangle, sawtooth and noise. These were combined very
  > nicely (the audio equivilent of RGB) to reproduce recorded speach.
  >
  > That what you mean?
  >
  > Bob Washburne

  Hello,

  That was done using PWM, a time-domain technique.
  You can't do it in frequency domain, because the ear is a several 1000
  channel analyzer versus 3 channels of the eye. (Yes, it's 3 - the
  luminance sensors (the 'rods') have the same sensitivity as the 'green'
  channel 'cones')

  Back to scanning - if you need to get all the info that is in a
  photograph ABOUT THE ORIGINAL SCENE, a three channel scanner is enough,
  because the original photo process has already reduced it to 3 chans.
  By using a multispectral scanner, you'll only get more info about the
  spectral shapes of the pigments (dyes) that make up the photo.

  But I suspect that those 19th century photos are single-channel anyway?

  Marko Cebokli

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