Ideas from Wolf Faust, who is not on the lcms-user list so he can't
respond there.
Bob
---------- Forwarded message ----------
Date: Tue, 21 Jun 2005 09:22:04 +0200
From: Wolf Faust <[EMAIL PROTECTED]>
To: Bob Friesenhahn <[EMAIL PROTECTED]>
Subject: Re: [Lcms-user] Printer-profiling via scanner (was devicelink...)
Dear Bob,
I currently do not receive any lcms-user ML postings nor did I post
anything to the ML. So I can not post to lcms-user.
So I do not know what the discussion is about... from what you sent,
here my $0.02:
On 20 Jun 2005 at 18:34, Bob Friesenhahn wrote:
On Mon, 20 Jun 2005, Hal V Engel wrote:
Having ink specific IT8.7 charts would make the creation of printer profiles
using a scanner significantly more accurate then when using generic IT8.7
charts since this would eliminate the metamerism problem. I would also
You are saying that your scanner acts like a spectrophotometer? I
find it difficult to believe that using LEDs in the scanner causes it
to not suffer from metamerism.
A scanner surely is not a spectrometer. Under normal conditions, when
using a standard IT 8.7/2 photo paper based target and than scanning
ink based prints you do get color faults.
But why not setting up a database with the spectral data of the ink,
paper,... used? Using this data, one could develop a correction
routine for the scanner. So, you still do need a target, a
spectrometer and you do need to measure the ink/paper profiled. The
benefit I see in this method is, that the user making the profile
doesn't need a spectrometer as long as the used material/device is in
the database. Building a spectral database for most profiling tasks
would be rather easy and you could ask users of unsupported setups to
send in test prints in order to complete the database.
Sure, a spectrometer would still be better, but I think using such a
correction, cheap scanner based printer profilers could become much
better. Scanning in general could benefit from such a correction. I
don't think current solutions like ProfilePrism or EZColor have
reached the possible limits.
But I guess there are also other possible methods you can use to fix
the metamerism faults in order to get a pleasing printer profiling
result - not necessarily an accurate result. The printer profiler I
did develop in ~1989 for instance did add color faults to the profile
as long as it does improve visual appearance. Let's face it, most
users do not want accuracy, they do want a result that appears good.
With kind regards
Wolf Faust
--
Wolf Faust Tel: +49-69-5486556
mailto:[EMAIL PROTECTED] Fax: +49-69-95409598
http://www.coloraid.de Mobile: +49-179-6924769
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