Digital BW, The Print

In a message dated 2/7/08 2:46:04 PM, daverich04@... writes:


> Hi David,
> 
> This might just be a question of semantics but I've worked in a photo lab 
> for a long time
> using a variety of densitometers. They're normally used for process control 
> and read red,
> green and blue densities. Is that something different from what you're 
> saying?
> 
> 
Reading Red, Green, and Blue densities just helps you linearize each color 
channel, or   (making some dangerous assumptions) perhaps cross balance them. It 
does not tell you, for instance, how saturated the red is, or if its a bit 
orange, or a bit purple... that requires a color reading device, such as a 
colorimeter, rather than a density reading device, like a densitometer. ICC 
profiles require actual color information, not just density information. By the way, 
a densitometer doesn't even know if the ramp its reading is Red, Green, or 
Blue, you have to read the right strips in the right order...


C. David Tobie
WW Product Technology Manager
Digital Imaging & Home Theater
Datacolor
CDTobie@...
www.datacolor.com/Spyder3


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