the benefit of 64-bit processor chips

Discussion in 'General Technical Discussion' started by Iliah, Mar 31, 2007.

  1. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    According to multiple recent reports, the use of 64-bit processors for raw conversion allows to double the dynamic range and to half the noise levels, compared to 32-bit processor chips.
     
  2. sfoxjohn

    sfoxjohn

    May 1, 2005
    Marlton, NJ
    My first reaction is that the last 32 bits would have almost no effect on either. I might surely be wrong, but I would expect that the effect of having a 64 bit processor over a 32 bit one is to speed up computations, not enhance data.

    Are they saying that the width of the data bus in the processor can make such differences?

    Perhaps I misunderstand the statement.
     
  3. peterdove

    peterdove Guest

    I know what you mean, I ran the NEF from this thread

    https://www.nikoncafe.com/vforums/showthread.php?t=109057

    and look what happened

    http://www.soleyphotos.com/images/DSC_0185.jpg ( large image )

    Though I have yet to try it on my old 32bit motherboard which I still keep tied to my desk with a piece of string and powered by 2 duracells...

    Raw Magick Team
     
    Last edited by a moderator: Mar 15, 2017
  4. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Peter, have you used 64 bits in halves, to render highlights throw upper 32 bits, and shadows through the lower 32 bits? Or you swapped them, like I do?
     
    Last edited by a moderator: Mar 31, 2007
  5. Is it already April the first ???.

    Phillip.
     
  6. peterdove

    peterdove Guest

    Actually I found that if you take the raw data, and then split down to the basic nibbles, one gets a much greater tonal range. Staying at the level of a byte introduces too much grain.

    Raw Magick Team
     
  7. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    It has to do with the non-uniform noise when data is split into several access cycles, like banding in D200.
     
  8. Gale

    Gale

    978
    Jan 26, 2005
    Viera Fl
    Looks like Magick to me and folks that know what they are doing:>)))))
    Grins real bigggggggg
     
  9. Gale

    Gale

    978
    Jan 26, 2005
    Viera Fl
    Good seeing you Peter..
    Come by more often.
     
  10. sfoxjohn

    sfoxjohn

    May 1, 2005
    Marlton, NJ
    Phillip, you may have nailed it!
     
  11. Gale

    Gale

    978
    Jan 26, 2005
    Viera Fl
    Yeah, but Peter and Ilah nailed the picture

    there is a good reason to use Raw Magick.
    Its just a learning curve.
     
  12. If you are talking about the processor in the camera, doing a raw conversion in hardware, I could agree. If you are talking about the processor in the PC doing the raw conversion in software, I'd say no way... but it's indeed, April 1st real soon now (and already there in some parts of the world)... :smile:
     
  13. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Dear Philippe:

    Isn't it the known fact that some CF cards record images noisier then others? :confused: 
     
  14. HSNewman

    HSNewman

    173
    Aug 17, 2006
    Maryland
    Yes. You should always buy cards that are rectangular, otherwise the roundoff will increase the noise.
     
  15. cwilt

    cwilt

    Apr 24, 2005
    Denver, CO
    Faster cards are not always better. Faster cards can add noise to circuits and to the image.
     
  16. cwilt

    cwilt

    Apr 24, 2005
    Denver, CO
    I'm still working the bugs out of my 64 bit system but it does seem to have the advantage. At least to my eyes. Here is my attempt with that image.

    [​IMG]
     
  17. Commodorefirst

    Commodorefirst Admin/Moderator Administrator

    May 1, 2005
    Missouri
    Interesting thread,

    I just posted my recovery attempts using a quick NX once over on the image, and I could have gotten a bit more detail out of the shadows, but interesting to see your results.

    [​IMG]

    Wade
     
  18. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Hi Wade,

    Try using 64 bits. That may get those purple ripples out of the water :wink:
     
  19. Stephen Fox

    Stephen Fox Guest

    April Fool!
     
  20. quad core like quad ccd readouts could perhaps cause banding depending on the tolerance of the cpus clock speeds but it would only be noticable when using a lot of +ve exposure comp in the raw processor

    Sil
     
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