Well that is an option only I just hate to take the time scanning. I am still running CS2 so I will have to check and see if it has that feature in it. Its one I didn't know about
-------- Original Message --------
Subject: Re: densitometers
From: Roger Eichhorn <eichhorn@xxxxxx>
Date: Sun, October 11, 2009 9:20 pm
To: List for Photo/Imaging Educators - Professionals - Students
<photoforum@xxxxxxxxxxxxxxxxxx>
if i recall correctly, PhotoShop allows one to set up and measure the
density of a step wedge that can then be printed out on transparency
film. Will that do to calibrate? Or, why can't one just scan the b&w
negative and use the photoshop densitometer to make the measurements
and avoid building or buying anything else at all?
Roger
On 11 Oct 2009, at 7:06 PM, ADavidhazy wrote:
> It is calibrated against a calibrated step wedge sold by Stauffer
> (sp?)
>
> andy
>
> Roger Eichhorn wrote:
>
>> How do you calibrate it once you have it built?
>> A few years ago I ran into an EE friend who was returning to the
>> college from a purchasing expedition. He said that he was picking
>> up a "constant voltage source" -- alkaline batteries. It used to
>> require mercury cells, probably no longer available.
>> Roger
>
