In your on-line review of the LS-2000, I found the following comment under The Basics, "The maximum resolution of the LS-2000 is 2700 dpi, resulting in a maximum image size of 2592 x 3894 for 35 mm film."

I'm interested in finding the algorithm that converted maximum resolution to maximum image size? I searched Nikon's Web site and found the following specifications. Reading resolution: 2592 pixel monochrome linear CCD and 2700 optical DPI. Scanning area: 2592 x 3894 pixels.

Question: Is the 2592 pixel monochorme linear CCD synonymous, and statistical the same as, 2700 optical DPI? If yes, why the small difference in values?

-- (anonymous) ((removed by request)), June 16, 1999

Answers

The resolution of the sensor is 2700 DPI(really 2700 PPI - Pixels Per Inch). DPI is Dots Per Inch. If a 35mm negative is actually .96" x 1.44222", then the image size, when imaged at 2700 DPI, would be 2592 x 3894 dots.

ie: .96" x 2700 DPI = 2592 pixels 1.442" x 2700 DPI = 3894 pixels

You see the linear sensor array is only .96" wide, not a full inch. Since the individual sensors in the array are placed on centers that correspond to 1/2700" and you only have to scan a .96" wide area, you only get 2592 pixels. Since the array is linear(only runs in one dimension, with the other dimension having only one sensor width in that direction) the length of the scanned image is dependant on the material being scanned. In the case of a piece of 35mm film 1.44222" long it ends up 3894 pixels long. Hope that makes some sense.

-- Gerald M. Payne (gmp@francorp.francomm.com), June 16, 1999.