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#21
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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
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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
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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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