Re: metamerism & proofing setup
Re: metamerism & proofing setup
- Subject: Re: metamerism & proofing setup
- From: email@hidden
- Date: Fri, 13 Jun 2003 08:43:31 EDT
In a message dated 6/12/03 5:03:45 PM, email@hidden writes:
>
Here's how it works (in theory);
>
>
1. Take spectral readings of both the printer target and proofer target
and
>
convert the spectral measurements into Lab(customsource) instead of the
>
normal Lab(D50).
>
>
I do this the hard way in Excel but the latest ProfileMaker (4.1.5) allows
>
you to import any source spectrum and make profiles for that custom source.
>
But if you can find out how to do it without calling tech support, good
>
luck!
>
>
2. Profile your camera and shoot the original under identical or similar
>
lighting (yeah, I know tungsten's hot, but it's cooler than metamerism
>
failure!)
>
>
3. Create a reference file for your camera profiling target in the same
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spectrum as your camera lights, i.e. Lab(camerasource).
>
>
4. Fly me to Hawaii if it works.
>
Step four seems at least as convenient as the others! Considering that many
images are preshot, or under uncontrolled lighting ("Excuse me Mister Sun,
would you please shine tungsten for a minute?") the limitations here are
pretty
restrictive. My comment about simply moving the color slider back and forth
between blue and yellow sounds better all the time. It is an intriguing
theory,
however.
C. David Tobie
Design Cooperative
email@hidden
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