Re: scanner density-value relation

From: Ryuji Suzuki ^lt;[email protected]>
Date: 03/10/05-01:06:31 AM Z
Message-id: <>

From: Don Bryant <>
Subject: RE: scanner density-value relation
Date: Wed, 09 Mar 2005 09:05:31 -0500

> You can use Vuescan software to obtain log density values directly.

Yup, I've been using it for long enough to know that. The reason I
wrote a program is to average out a certain measurement aperture to
reduce noise and perturbation from fine surface texture (especially
with prints). Also, I could have my own calibration table based on the
raw scans of a calibrated step tablet. (The program I wrote was a bit
easier than making a vocoder program so that I could make a funny
greeting message for my voice mail, and go to karaoke to sing
something stupid... remember Roger Troutman & Zapp?)

> However it has been my experience with several different Epson
> scanners as well as a couple of Microtec scanners that the DMAX
> ratings are way way over inflated.

...and the quantitative comparison of which was the center of my
original question.

> IMO, you are wasting your time trying to do serious densitometry without a
> densitometer. A good used XRITE 810 isn't that expensive.

The point well taken. 810 would do.

Ryuji Suzuki
"Well, believing is all right, just don't let the wrong people know
what it's all about." (Bob Dylan, Need a Woman, 1982)
Received on Thu Mar 10 01:06:38 2005

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