Digital BW, The Print

In his posting of Mon, 23 Jul 2012,  writes
snip

>Plustek OpticFilm 120
>Image Sensor       CCD
>Light Source        LED
>Hardware Resolution Maximum Input：  10600 dpi
>Maximum Output：      5300 dpi
>Scan Modes Color:       48-bit input, 24/48-bit output
>Grayscale:         16-bit input, 8/16-bit output
>Dynamic Range       4.8
>Infrared Built-in
>Scanning Area (W x L)     60 mm x 120 mm
>IT8 Target        Included for color accuracy
>Power Supply       24 Vdc / 0.75 A
>Interface         USB 2.0
>Net Weight        Approx. 5.7 Kgs
>Dimensions (W x D x H)     210 x 374 x 189 mm
Snip

When I read scanner manufacturer's claims of 4.8 dynamic range I suspect 
all of their claims!   There is absolutely no way this is possible in a 
desktop CCD scanner!   A top drum scanner in perfect condition can only 
manage about 4.2 that's the reality guys and nothing beats a drum 
scanner in good hands.

I remember in years past that when all the desktop CCD scanner makers 
were making increasingly exaggerated claims for dynamic range that when 
challenged about their claims for 4.8 the MD of Imacon said that it was 
a marketing statement.  I read that as lies.

Cheers

Richard
-- 
Richard Kenward
richard@...
web site at <www.precision-drum-scanning.co.uk>
phone+44 (0) 1873 890 767
fax +44(0) 1873 890 565