Re: istD bit depth

[Peter J. Alling]

All of this implies higher power consumption...
Jostein wrote:
Shel,
I think what John is saying is that it takes significantly more power
to compute the four extra bits per pixel between 12 and 16. You'd need
much stronger number-crunching logic around the chip, and more RAM as
well, to make processing of the image from chip to storage medium go
reasonably quick. With a scanner you accept a much longer exposure
time per "shot" than you would with a DSLR.
Cameras can have 14 or 16 bit depth, and a price tag to match...:-)
Jostein
----- Original Message ----- 
From: "Shel Belinkoff" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, October 23, 2004 9:51 PM
Subject: Re: istD bit depth

 

Hi John ...
Couldn't forget that linear stuff since I never knew it <vbg>
Don't really understand the 2D thing.  Are there two rows of pixels,
   

one
 

below the other?  Nah, that can't be it?  So how come the 'blad can
   

have a
 

16-bit sensor, and some DSLR cameras 14-bit?  Is it a matter of
   

space
 

(which is what I'm inferring from your remarks)?  I heard talk of a
   

Nikon
 

D3 with a 16-bit sensor, BTW ...
Shel
   

[Original Message]
From: John Francis <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Date: 10/23/2004 12:42:22 PM
Subject: Re: istD bit depth
Shel Belinkoff mused:
     

The istD has a bit depth of 12.  I seem to recall some DSLR with
       

a bit
 

depth of 14 ... maybe.  The specs on the new Hasselblad claim a
       

bit
 

depth
   

of 16.  Why is it that so many DSLR cameras are using a bit
       

depth of
 

12?
   

Is there a physical or design reason?  Cost?  My little Nikon
       

scanner
 

has a
   

bit depth of 16 ... why not a DSLR?
Shel
       

Don't forget that your scanner only has a single row of sensors,
     

not a
 

two-dimensional array, and that it only has to work at a single
     

speed.
 

Of the two, the fact that it's only a linear sensor is more
     

important.
 

You can put the extra processing elements, etc., alongside the
     

sensor
 

without having to worry too much how much room they take up.  In a
     

2D
 

sensor you're trying to put another row of pixels there.
     

   


 


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