Re: Measuring DMAX
Title: Re: Measuring DMAX
Somewhere I have a device marketed by Kodak many years ago. This is a sheet of card, rather like a grey-card but printed with patches of different reflection density. Each patch has a hole in it, so you can place it over a print, find the matching density and read off the value. Fairly crude, but effective – not least because when you do the match, both the print and the reference are in the same illumination. Must be thirty years old, and if you give me a week or two I might even be able to find it!
On 14/1/08 21:30, "Dave S" <email@example.com> wrote:
You should be able to find a lot of information through internet. I remember seeing lots of articles on this when scanner was becoming popular.
I had/have both densitometer and scanner, so at one time (many many years ago) I tried it out, and the measurement using scanner is quite reasonable.
From: Marek Matusz [mailto:firstname.lastname@example.org]
Sent: Monday, January 14, 2008 4:03 PM
Subject: Measuring DMAX
Is there a way to measure the DMAX of a print with a scanner /Photoshop? I do not have a densitometer at hand. I vaguely remember a thread a while back, but could not find it.
> Date: Sun, 13 Jan 2008 10:06:14 -0500
> From: email@example.com
> Subject: Re: Fresson question
> To: firstname.lastname@example.org
> Reflective D-Max is just a term that describes the darkness of a
> print as measured with a densitometer, so it is expressed as a log
> value. Pt./Pd., kallitype and vandyke prints on art papers generally
> have a maximum Dmax of about log 1.45 - 1.55. Silver prints on glossy
> papers can have a Dmax of up to log 2.2 or even higher. A direct
> carbon print like a Fresson print will have a maximum Dmax of below
> log 1.4. Carbon transfer prints can have a reflective Dmax as high as
> silver papers, though this depends on many working conditions.
> Reflective D-Max is a technical description and does not make any
> implication about aesthetic quality, though many pursue it for its
> own sake as they do detail and sharpness.
> At 12:25 AM -0500 1/12/08, Judy Seigel wrote:
> >Now, however, a possibly dumb question... though I doubt anyone's
> >reading this far, so what the hey: What is "reflective D-Max"?
> >D-max on an opaque surface rather than in a transparency? Or?
> >(I've never seen that term -- tho, just ask me & I'll explain ULF.)
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