Datacolor User to User Support Group.

Is it best to have one or two sheets of the same paper you're
profiling under the test print being measured or would something else
be better? Gray mate board? Another color matte board? My desk is Oak
and may affect measurements on thin papers.

--- In colorvision_group@yahoogroups.com, "davedoughman"
<davedoughman@...> wrote:
>
> Is it best to have one or two sheets of the same paper you're
> profiling under the test print being measured or would something else
> be better? Gray mate board? Another color matte board? My desk is Oak
> and may affect measurements on thin papers.
>

or indeed ... you might want to profile your media on top of your
mounting substrate!

In a message dated 3/7/06 12:27:31 PM, davedoughman@... writes:


> Is it best to have one or two sheets of the same paper you're
> profiling under the test print being measured or would something else
> be better? Gray mate board? Another color matte board? My desk is Oak
> and may affect measurements on thin papers.
> 
> 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?

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com

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?