Re: Scanner profiling, Screen Cezanne
Re: Scanner profiling, Screen Cezanne
- Subject: Re: Scanner profiling, Screen Cezanne
- From: Don Hutcheson <email@hidden>
- Date: Thu, 05 May 2005 15:39:54 -0400
I have tried to get raw RGB out of Screen (a.k.a. "DS" or "Dai Nippon")
scanners for many years without success. Newer models like Cezanne do offer
an RGB mode, but the data has already been through some saturation function
that apparently can't be defeated, making it useless for serious work.
As far as I can tell, the reason for this dates back to the early 1970s when
a division of Dai Nippon Printing was exclusive Japanese agent for the
English Linoscan 204 scanner. At that time, Linoscan scanners (ancestors of
the current ICG), used a hard-wired analog "pre-correction" circuit (just a
simple 3x3 matrix) to solve the main ink errors. This was followed by a full
24-channel analog color correction circuit, similar to those on Hell and
Crosfield scanners.
About 9 months after Japanese orders for the 204 mysteriously dried up, Dai
Nippon (now Screen) announced the first Japanese color scanner. The folk at
Linoscan reverse-engineered the new scanner and found exactly the same
hard-wired pre-correction! Pretty conclusive evidence that Dai Nippon had
simply copied the Linoscan color computer, pre-correction and all.
To this day all newer Screen scanners obediently include this now- redundant
pre-correction, probably because nobody at Screen knows why it's there! As
a result, the "RGB" mode on Screen scanners gives over-saturated RGB images
with 0s and 255s where they shouldn't be. You can make a profile of sorts,
but image quality is seriously compromised by the over-saturation.
Don't you love history?
Don
On 5/5/05 10:40 Jorgen Jansson wrote:
> Is there anyone out there who has profiled a Screen Cezanne (FT-S5000) flatbed
> scanner? With the ColorGenius EX 2.0 software?
> If so, I would be very grateful for some information on how you set up the
> software. I just can't understand what the manual is saying... I'm looking
> for a way to produce a raw scan with a set gamma and set density end points.
******************************
Don Hutcheson
Hutcheson Consulting
(Color Management Solutions)
11 Turnburry Rd
Washington, NJ 07882
Phone: (908) 689 7403
Mobile: (908) 500 0341
Fax: (908) 689 5305
E-mail: email@hidden
******************************
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