Nikon LS-4500AF Bedienungsanleitung PDF herunterladen (Seite 63)

Nikon

Film Scanner LS-4500AF User's Manual

The film is inserted from the front, moved in sequence and scanned.

The LS-4500AF is a scanner of light source color switching type, film

moving type, and surface sequence type.

The machine has two optical systems, and scanning of both 4 x 5 inch film

and 35mm film is possible by switching between them.

12-bit A/D and LUT (Look Up Table)

The LS-4500AF has a 12 bit A/D converter.

12-bit resolution is thus possible (2

= 4096 levels). This can be converted

to 8-bit data (2

= 256 levels) by using an LUT (look up table).

The conversion from 12 to 8 bits is necessary because many systems deal

with image data in 8-bit form.

4096

256

Input

Output

If the number obtained by simply dividing the data by 16 (=4096/256) were

output, the LUT would be meaningless. The LUT has the ability to

condense data from 4096 levels to 256 levels, without a loss of white data

while maintaining keeping black gradations (high density side).

The LUT is used gamma (non-linearity) compensation of the output (as in

the case of a CRT monitor).

The LUT also provides for black tuning and white tuning.

It is possible to intentionally lose black data or skip white data.

9. Technical Tips on the LS-4500AF

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Nikon LS-4500AF Bedienungsanleitung Seite 63