Datacolor User to User Support Group.

In an earlier thread, C.D. Tobie advised the use of second sheet of the same paper, under 
the paper that is being measured for a profile.

Tonight I read the following message

<http://forums.dpreview.com/forums/read.asp?forum=1003&message=18964864>

in which the poster mentions two different approaches to this: an ANSI standard that calls 
for a black substrate, and an ISO standard that calls for a white substrate.

Does the color of the substrate make a significant difference in the profile?  If so, does the 
correct choice depend on how the prints made with the profile are going to be mounted 
and illuminated?  Does the design of the PFP device and software assume a particular 
substrate?

If anyone is likely to see this effect, it might be me, since I have been making profiles on a 
black desktop.  But I have not yet tried a comparison with profiles made on a white 
substrate.

--- In colorvision_group@yahoogroups.com, "julianv1" <julianv@...> wrote:
>
> In an earlier thread, C.D. Tobie advised the use of second sheet of
the same paper, under 
> the paper that is being measured for a profile.
> 
> Tonight I read the following message
> 
> <http://forums.dpreview.com/forums/read.asp?forum=1003&message=18964864>
> 
> in which the poster mentions two different approaches to this: an
ANSI standard that calls 
> for a black substrate, and an ISO standard that calls for a white
substrate.
> 
> Does the color of the substrate make a significant difference in the
profile?  If so, does the 
> correct choice depend on how the prints made with the profile are
going to be mounted 
> and illuminated?  Does the design of the PFP device and software
assume a particular 
> substrate?
> 
> If anyone is likely to see this effect, it might be me, since I have
been making profiles on a 
> black desktop.  But I have not yet tried a comparison with profiles
made on a white 
> substrate.
>


If you want the most accurate final rendition possible, take readings
on the substrate you will be mounting your final image on.

Tom

From: julianv1 <julianv@...>


>>in which the poster mentions two different approaches to this: an 
ANSI standard
that calls
for a black substrate, and an ISO standard that calls for a white 
substrate.

Yes, this comes up every so often...

>>Does the color of the substrate make a significant difference in the 
profile?

That depends entirely on how thick and opaque the media is...

>>If so, does the
correct choice depend on how the prints made with the profile are going 
to be
mounted
and illuminated?

Yes, its possible to make a case for using a black substrate when 
profiling for canvas that will be stretched and left in front of a dark 
void. In most other cases, a white backing is used.

  Does the design of the PFP device and software assume a
particular
substrate?

No, it simply assumes that you'll measure in circumstances that relate 
to your final print circumstances. This would be true for oversprays, 
and some top laminates as well; though varnishes can be so thick that 
they can sometimes be problematic.

>>If anyone is likely to see this effect, it might be me, since I have 
been making
profiles on a
black desktop.

That will depend entirely on the media in question...

>>  But I have not yet tried a comparison with profiles made on a
white
substrate.

Measure a sheet of your paper on the desk, then on several more sheets 
of the same paper (using the Measure commend in the Tools menu) and see 
what degree of difference there is. If its major, you may want to 
remeasure previous targets and build new versions of your profiles.





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