the benefit of 64-bit processor chips

Joined
Jan 29, 2005
Messages
2,761
Location
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.
 
Joined
May 1, 2005
Messages
1,804
Location
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.
 
P

peterdove

Guest
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.
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:
Joined
Jan 29, 2005
Messages
2,761
Location
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:
P

peterdove

Guest
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?
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
 
Joined
Jan 26, 2005
Messages
978
Location
Viera Fl
Looks like Magick to me and folks that know what they are doing:>)))))
Grins real bigggggggg
 
Joined
Feb 6, 2005
Messages
3,497
Location
South SF Bay Area, CA.
It has to do with the non-uniform noise when data is split into several access cycles, like banding in D200.
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:
 
Joined
Jan 29, 2005
Messages
2,761
Location
nowhere
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:
Dear Philippe:

Isn't it the known fact that some CF cards record images noisier then others? :confused:
 
Joined
Aug 17, 2006
Messages
173
Location
Maryland
Isn't it the known fact that some CF cards record images noisier then others? :confused:
Yes. You should always buy cards that are rectangular, otherwise the roundoff will increase the noise.
 
Joined
Apr 24, 2005
Messages
6,099
Location
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.

Subscribe to see EXIF info for this image (if available)
 

Commodorefirst

Admin/Moderator
Administrator
Joined
May 1, 2005
Messages
20,711
Location
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.

Subscribe to see EXIF info for this image (if available)


Wade
 
Joined
Dec 29, 2005
Messages
2,434
Location
Bournemouth, UK
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
 
Links on this page may be to our affiliates. Sales through affiliate links may benefit this site.
Nikon Cafe is a fan site and not associated with Nikon Corporation.
Forum post reactions by Twemoji: https://github.com/twitter/twemoji
Copyright © 2005-2019 Amin Forums, LLC
Top Bottom