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Current view on drum scanners?



 
 
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  #21  
Old November 12th 08, 05:06 PM posted to rec.photo.darkroom
Nicholas O. Lindan
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Posts: 1,227
Default Current view on drum scanners?

"Airbus" wrote

Amazing that this 1930's technology strill holds its own, and indeed
offers the
"high end" solution in today's digital world. . .


There is nothing else that combines the sensitivity and speed.

Since only a very tiny spot about 200 1/1,000,000th's of an inch across
is being scanned the total amount of light from this spot is pretty weak --
even with the bright light sources and fancy condenser systems. To keep the
scan times reasonable the sensor can't dwell on any part of the image
for very long.

If speed weren't an issue then a photodiode would make a better sensor.

The CCD's in a scanner do image the same spot size but as there are several
thousand acting in parallel the amount of time a sensor can dwell on a part
of the image is considerably longer.

If a photodiode were to be used in a drum scanner the scan time would
be 4,000 times longer (gross, wild-arsed-guess estimate).

--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.darkroomautomation.com/da-main.htm
n o lindan at ix dot netcom dot com


  #22  
Old November 12th 08, 05:09 PM posted to rec.photo.darkroom
Nicholas O. Lindan
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Posts: 1,227
Default Current view on drum scanners?

"Jean-David Beyer" wrote
The hottest places in hell are reserved for those who in times of great
moral crises maintain their neutrality.

- Dante Alighieri


Ah, hell is populated by the Swiss and the Swedes. Makes sense...

--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.darkroomautomation.com/da-main.htm
n o lindan at ix dot netcom dot com


  #23  
Old November 12th 08, 05:18 PM posted to rec.photo.darkroom
Jean-David Beyer
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Posts: 247
Default Current view on drum scanners?

Nicholas O. Lindan wrote:
"Jean-David Beyer" wrote
The hottest places in hell are reserved for those who in times of great
moral crises maintain their neutrality.

- Dante Alighieri


Ah, hell is populated by the Swiss and the Swedes. Makes sense...

I thought it went like this:

In Heaven...
the French are the cooks
the Germans are the engineers
the British are the police
the Swiss are the managers
the Italians are the lovers

In Hell...
the British are the cooks
the French are the managers
the Italians are the engineers
the Germans are the police
the Swiss are the lovers

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 11:15:01 up 16:58, 4 users, load average: 5.26, 4.66, 4.43
 




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