Datacolor User to User Support Group.

David,

I understood that the 'ICC standard' was to have a black backing for reading 
targets? This should presumably give minimal interference with the readings 
of the target.

I thought the idea of putting sheets of the same paper under the target was 
to simulate the printed page in a magazine or book, where the color of the 
page will be affected by the reflections from the pages underneath. I tried 
this with varying numbers of sheets of Epson Premium Glossy paper once, and 
the readings changed up to 6 sheets, when they became constant.

The most appropriate backing must surely be whatever the print is going to 
be mounted on. If it is going to be mounted on a grey board, put the target 
on the same gray board; if on a white board, use the same white board, or on 
a black board.............

Or is this nonsense?

Bob Frost.


----- Original Message ----- 
From: <CDTobie@...>
>>
>> Take a sheet of the paper in question, choose the Measure function from 
>> the
> PFP Tools menu, and make a couple of test measurements to get the device 
> (and
> yourself) warmed up. Then meausure the white of your paper on an 
> artifically
> whitened paper backing, an unbrightend white backing, and a   light gray
> backing. If you see differences in the results, your paper is thin enough 
> to require
> care in what backing you use. If the results are identical, I wouldn't 
> worry
> much about it. More of the same paper is a great way to back printed 
> targets.
> Or you can stick with a single white backing for all measurements, as long 
> as
> it doesn't glow too much in the dark... Reading an unwhitened thin paper 
> over a
> whitened backing would add in a factor that you wouldn't otherwise have, 
> and
> don't need to introduce. I suspect, given the relative nature of printer
> profiling measurements, that any of the above would make good profiles, 
> but why not
> do it right, if possible?