RE: Scanner profiling, Screen Cezanne
RE: Scanner profiling, Screen Cezanne
- Subject: RE: Scanner profiling, Screen Cezanne
- From: "Walter Zacharias" <email@hidden>
- Date: Fri, 6 May 2005 07:33:30 -0500
- Thread-topic: Scanner profiling, Screen Cezanne
Is there any other software choices than the ColorGenius to drive this
scanner? I guess that would be a question Screen won't want to answer.
Walter
-----Original Message-----
From: colorsync-users-bounces+walterz=email@hidden
[mailto:colorsync-users-bounces+walterz=email@hidden] On
Behalf Of Don Hutcheson
Sent: Thursday, May 05, 2005 2:40 PM
To: email@hidden
Subject: Re: Scanner profiling, Screen Cezanne
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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