Re: Measuring DMAX

[Yves Gauvreau <gauvreau-yves@cgocable.ca>]

Hi,

in my version of Vuescan you need to be in black and white mode to have a
single value.


Yves

----- Original Message -----
From: "Katharine Thayer" <kthayer@pacifier.com>
To: <alt-photo-process-l@usask.ca>
Sent: Wednesday, January 23, 2008 8:25 PM
Subject: Re: Measuring DMAX


>
>
> On Jan 15, 2008, at 12:46 AM, Kees Brandenburg wrote:
>
> > Hi Marek,
> >
> > Vuescan <http://www.hamrick.com> can do that. First check the
> > 'Enable Density Display' option in preferences. Then point your
> > mouse to a location in the scan/preview window and hold the control
> > key. Vuescan displays the log density readings of the raw scan.
> > These readings are not altered by your scanner settings or profile.
>
> Kees, I get three density numbers at any given point  whether the
> image is in color or black and white. Is it reading three color
> densities for each point, or what?  I can't see any particular
> relationship between the density readings and the 0-255 readings from
> the same coordinates (that you get when you stop depressing the
> control key).   Is there any way to get one density reading for a point?
> Katharine